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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2018	Apr. 16, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Entity Current Reporting Status	Yes
Entity Registrant Name	WASTE MANAGEMENT INC
Entity Central Index Key	0000823768
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		431,283,814

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 52	$ 22
Accounts receivable, net of allowance for doubtful accounts of $22 and $21, respectively	1,700	1,805
Other receivables	504	569
Parts and supplies	98	96
Other assets	137	132
Total current assets	2,491	2,624
Property and equipment, net of accumulated depreciation and amortization of $17,860 and $17,704, respectively	11,637	11,559
Goodwill	6,327	6,247
Other intangible assets, net	597	547
Restricted trust and escrow accounts	422	319
Investments in unconsolidated entities	266	269
Other assets	366	264
Total assets	22,106	21,829
Current liabilities:
Accounts payable	791	1,040
Accrued liabilities	1,031	980
Deferred revenues	495	503
Current portion of long-term debt	1,056	739
Total current liabilities	3,373	3,262
Long-term debt, less current portion	8,901	8,752
Deferred income taxes	1,258	1,248
Landfill and environmental remediation liabilities	1,795	1,770
Other liabilities	714	755
Total liabilities	16,041	15,787
Commitments and contingencies
Waste Management, Inc. stockholders' equity:
Common stock, $0.01 par value; 1,500,000,000 shares authorized; 630,282,461 shares issued	6	6
Additional paid-in capital	4,916	4,933
Retained earnings	8,867	8,588
Accumulated other comprehensive income (loss)	(28)	8
Treasury stock at cost, 198,511,161 and 196,963,558 shares, respectively	(7,717)	(7,516)
Total Waste Management, Inc. stockholders' equity	6,044	6,019
Noncontrolling interests	21	23
Total equity	6,065	6,042
Total liabilities and equity	$ 22,106	$ 21,829

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
CONSOLIDATED BALANCE SHEETS
Allowance for doubtful accounts	$ 22	$ 21
Accumulated depreciation and amortization	$ 17,860	$ 17,704
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,500,000,000	1,500,000,000
Common stock, shares issued	630,282,461	630,282,461
Treasury stock, shares	198,511,161	196,963,558

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CONSOLIDATED STATEMENTS OF OPERATIONS
Operating revenues	$ 3,511	$ 3,440
Costs and expenses:
Operating	2,184	2,166
Selling, general and administrative	373	390
Depreciation and amortization	347	328
Restructuring	2	1
Net gain from divestitures	(3)	(3)
Total costs and expenses	2,903	2,882
Income from operations	608	558
Other income (expense):
Interest expense, net	(91)	(92)
Equity in net losses of unconsolidated entities	(7)	(32)
Other, net	1
Total other income (expense)	(97)	(124)
Income before income taxes	511	434
Income tax expense	116	137
Consolidated net income	395	297
Less: Net loss attributable to noncontrolling interests	(1)	(1)
Net income attributable to Waste Management, Inc.	$ 396	$ 298
Basic earnings per common share	$ 0.91	$ 0.68
Diluted earnings per common share	0.91	0.67
Cash dividends declared per common share	$ 0.465	$ 0.425

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Consolidated net income	$ 395	$ 297
Derivative instruments, net	2	2
Available-for-sale securities, net	(1)	1
Foreign currency translation adjustments	(32)	10
Post-retirement benefit obligation, net		1
Other comprehensive income (loss), net of tax	(31)	14
Comprehensive income	364	311
Less: Comprehensive loss attributable to noncontrolling interests	(1)	(1)
Comprehensive income attributable to Waste Management, Inc.	$ 365	$ 312

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Consolidated net income	$ 395	$ 297
Adjustments to reconcile consolidated net income to net cash provided by operating activities:
Depreciation and amortization	347	328
Deferred income tax expense (benefit)	(15)	36
Interest accretion on landfill liabilities	23	22
Provision for bad debts	12	11
Equity-based compensation expense	23	36
Net gain on disposal of assets	(5)	(3)
(Income) expense from divestitures, asset impairments and other, net	(3)	22
Equity in net losses of unconsolidated entities, net of dividends	7	7
Change in operating assets and liabilities, net of effects of acquisitions and divestitures:
Receivables	183	151
Other current assets	(8)	(8)
Other assets	(1)	(6)
Accounts payable and accrued liabilities	(119)	(144)
Deferred revenues and other liabilities	(30)	(27)
Net cash provided by operating activities	809	722
Cash flows from investing activities:
Acquisitions of businesses, net of cash acquired	(246)	(8)
Capital expenditures	(400)	(332)
Proceeds from divestitures of businesses and other assets (net of cash divested)	14	7
Other, net	(5)	(4)
Net cash used in investing activities	(637)	(337)
Cash flows from financing activities:
New borrowings	61	54
Debt repayments	(80)	(541)
Net commercial paper borrowings	471	210
Common stock repurchase program	(250)
Cash dividends	(206)	(194)
Exercise of common stock options	23	77
Tax payments associated with equity-based compensation transactions	(28)	(32)
Other, net	(29)	41
Net cash used in financing activities	(38)	(385)
Effect of exchange rate changes on cash, cash equivalents and restricted cash and cash equivalents	(1)
Increase in cash, cash equivalents and restricted cash and cash equivalents	133
Cash, cash equivalents and restricted cash and cash equivalents at beginning of period	293	94
Cash, cash equivalents and restricted cash and cash equivalents at end of period	$ 426	$ 94

CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2018	Mar. 31, 2017
Reconciliation of cash, cash equivalents and restricted cash and cash equivalents at end of period
Cash and cash equivalents	$ 52	$ 30
Restricted cash and cash equivalents included in restricted trust and escrow accounts	374	64
Cash, cash equivalents and restricted cash and cash equivalents at end of period	$ 426	$ 94

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - 3 months ended Mar. 31, 2018 - USD ($) shares in Thousands, $ in Millions	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Noncontrolling Interests [Member]	Total
Beginning balance at Dec. 31, 2017	$ 6	$ 4,933	$ 8,588	$ 8	$ (7,516)	$ 23	$ 6,042
Beginning balance, shares at Dec. 31, 2017	630,282				(196,964)
Equity roll forward
Adoption of new accounting standards			85	(5)			80
Consolidated net income			396			(1)	395
Other comprehensive income (loss), net of tax				(31)			(31)
Cash dividends			(206)				(206)
Equity-based compensation transactions, net of tax		(17)	4		$ 57		44
Equity-based compensation transaction, shares					1,483
Common stock repurchase program					$ (258)		(258)
Common stock repurchase program, shares					(3,031)
Other, net						(1)	(1)
Other, net, shares					1
Ending balance at Mar. 31, 2018	$ 6	$ 4,916	$ 8,867	$ (28)	$ (7,717)	$ 21	$ 6,065
Ending balance, shares at Mar. 31, 2018	630,282				(198,511)

Basis of Presentation

3 Months Ended

Mar. 31, 2018

Basis of Presentation

Basis of Presentation

1. Basis of Presentation

The financial statements presented in this report represent the consolidation of Waste Management, Inc., a Delaware corporation; its wholly-owned and majority-owned subsidiaries; and certain variable interest entities for which Waste Management, Inc. or its subsidiaries are the primary beneficiaries as described in Note 13. Waste Management, Inc. is a holding company and all operations are conducted by its subsidiaries. When the terms “the Company,” “we,” “us” or “our” are used in this document, those terms refer to Waste Management, Inc., its consolidated subsidiaries and consolidated variable interest entities. When we use the term “WM,” we are referring only to Waste Management, Inc., the parent holding company.

We are North America’s leading provider of comprehensive waste management environmental services. We partner with our residential, commercial, industrial and municipal customers and the communities we serve to manage and reduce waste at each stage from collection to disposal, while recovering valuable resources and creating clean, renewable energy. Our “Solid Waste” business is operated and managed locally by our subsidiaries that focus on distinct geographic areas and provides collection, transfer, disposal, and recycling and resource recovery services. Through our subsidiaries, we are also a leading developer, operator and owner of landfill gas-to-energy facilities in the United States (“U.S.”).

We evaluate, oversee and manage the financial performance of our Solid Waste business subsidiaries through our 17 Areas. We also provide additional services that are not managed through our Solid Waste business, which are presented in this report as “Other.” Additional information related to our segments is included in Note 8.

The Condensed Consolidated Financial Statements as of March 31, 2018 and for the three months ended March 31, 2018 and 2017 are unaudited. In the opinion of management, these financial statements include all adjustments, which, unless otherwise disclosed, are of a normal recurring nature, necessary for a fair presentation of the financial position, results of operations, comprehensive income, cash flows, and changes in equity for the periods presented. The results for interim periods are not necessarily indicative of results for the entire year. The financial statements presented herein should be read in conjunction with the financial statements included in our Annual Report on Form 10‑K for the year ended December 31, 2017.

In preparing our financial statements, we make numerous estimates and assumptions that affect the accounting for and recognition and disclosure of assets, liabilities, equity, revenues and expenses. We must make these estimates and assumptions because certain information that we use is dependent on future events, cannot be calculated with precision from available data or simply cannot be calculated. In some cases, these estimates are difficult to determine, and we must exercise significant judgment. In preparing our financial statements, the most difficult, subjective and complex estimates and the assumptions that present the greatest amount of uncertainty relate to our accounting for landfills, environmental remediation liabilities, long-lived asset impairments and reserves associated with our insured and self-insured claims. Actual results could differ materially from the estimates and assumptions that we use in the preparation of our financial statements.

Adoption of New Accounting Standards

Revenue Recognition — In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09 associated with revenue recognition. On January 1, 2018, we adopted ASU 2014-09 using the modified retrospective approach for all ongoing customer contracts. Our results of operations for the reported periods after January 1, 2018 are presented under this amended guidance, while prior period amounts are not adjusted and continue to be reported in accordance with historical accounting guidance.

The impact of adopting the amended guidance primarily relates to (i) the deferral of certain sales incentives, which previously were expensed as incurred, but under the new guidance are capitalized as other assets and amortized to selling, general and administrative expenses over the expected life of the customer relationship and (ii) the recognition of certain consideration payable to our customers as a reduction in operating revenues, which under historical guidance was recorded as operating expenses. We recognized a net $80 million increase to our retained earnings as of January 1, 2018 for the cumulative impact of adopting the amended guidance associated with the capitalization of sales incentives as contract acquisition costs consisting of a $108 million asset and a related $28 million deferred tax liability. There were no other material impacts on our consolidated financial statements as a result of our adoption of this amended guidance.

For contracts with an effective term greater than one year, we applied the standard’s practical expedient that permits the exclusion of unsatisfied performance obligations as our right to consideration corresponds directly to the value provided to the customer for services completed to date and all future variable consideration is allocated to wholly unsatisfied performance obligations. We also applied the standard’s optional exemption for performance obligations related to contracts that have an original expected duration of one year or less. See Note 4 for additional information and disclosures related to this amended guidance.

Financial Instruments — In January 2016, the FASB issued ASU 2016‑01 associated with the recognition and measurement of financial assets and liabilities with further clarifications made in February 2018 with the issuance of ASU 2018-03. The amended guidance requires certain equity investments that are not consolidated and not accounted for under the equity method to be measured at fair value with changes in fair value recognized in net income rather than as a component of accumulated other comprehensive income (loss). It further states that an entity may choose to measure equity investments that do not have readily determinable fair values using a quantitative approach, or measurement alternative, which is equal to its cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer. The Company adopted this amended guidance on January 1, 2018 using a prospective transition approach, which did not have an impact on our consolidated financial statements.

We concluded that all equity investments within the scope of ASU 2016-01, which primarily relate to equity securities previously accounted for under the cost method, do not have readily determinable fair values. Accordingly, the value of these investments beginning January 1, 2018 has been measured using a quantitative approach, or the measurement alternative, as noted above. As of March 31, 2018, the carrying amount of our investments without readily determinable fair values was $87 million. During the three months ended March 31, 2018, we did not recognize any impairments or other adjustments.

Statement of Cash Flows — In August 2016, the FASB issued ASU 2016‑15 associated with the classification of certain cash receipts and cash payments in the statement of cash flows. In November 2016, the FASB issued ASU 2016‑18 associated with the presentation of restricted cash and cash equivalents in the statement of cash flows. The objective of the amended guidance was to reduce existing diversity in practice. This amended guidance was retrospectively adopted on January 1, 2018 and required the following disclosures and changes to the presentation of our financial statements:

Cash, cash equivalents and restricted cash and cash equivalents reported on the Condensed Consolidated Statements of Cash Flows now includes restricted cash and cash equivalents of $62 million, $64 million and $271 million as of December 31, 2016, March 31, 2017 and December 31, 2017, respectively, as well as previously reported cash and cash equivalents.

Cash payments made within 120 days of the acquisition date of a business combination to settle a contingent consideration liability are classified as cash outflows from investing activities. Thereafter, cash payments up to the amount of the contingent consideration liability recognized at the acquisition date (including measurement-period adjustments) are classified as cash outflows from financing activities and any excess is classified as cash outflows from operating activities. The adoption of this amended guidance did not have a material impact on our Condensed Consolidated Statements of Cash Flows.

Our restricted cash and cash equivalents generally consist of funds deposited into specific accounts for purposes of funding insurance claims and demonstrating our ability to meet our landfill final capping, closure, post-closure and environmental remediation obligations.

Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income — In February 2018, the FASB issued ASU 2018-02 associated with the reclassification of certain tax effects from accumulated other comprehensive income (loss). This amended guidance allows a reclassification from accumulated other comprehensive income (loss) to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act (the “Act”) which was signed into law on December 22, 2017. We early adopted this amended guidance on January 1, 2018, and as a result, elected to reclassify $5 million of stranded tax effects from accumulated other comprehensive income (loss) to retained earnings using a specific identification approach. See Note 10 for additional disclosures related to this amended guidance.

Income Taxes — In March 2018, the FASB issued ASU 2018-05 associated with the accounting and disclosures around the enactment of the Act and the Securities and Exchange Commission’s Staff Accounting Bulletin No. 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act (“SAB 118”), which the Company has adopted. See Note 5 for the disclosures related to this amended guidance.

New Accounting Standards Pending Adoption

Financial Instrument Credit Losses — In June 2016, the FASB issued ASU 2016‑13 associated with the measurement of credit losses on financial instruments. The amended guidance replaces the current incurred loss impairment methodology of recognizing credit losses when a loss is probable, with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to assess credit loss estimates. The amended guidance is effective for the Company on January 1, 2020, with early adoption permitted beginning January 1, 2019. We are assessing the provisions of this amended guidance and evaluating the impact on our consolidated financial statements.

Leases — In February 2016, the FASB issued ASU 2016‑02 associated with lease accounting. There have been further amendments, including practical expedients, with the issuance of ASU 2018-01 in January 2018. The amended guidance requires the recognition of lease assets and lease liabilities on the balance sheet for those leases with terms in excess of 12 months and currently classified as operating leases. Disclosure of key information about leasing arrangements will also be required. The amended guidance is effective for the Company on January 1, 2019. We are assessing the provisions of this amended guidance and we have (i) formed an implementation work team; (ii) performed training for the various organizations that will be most affected by the new standard and (iii) acquired a software solution to manage and account for leases under the new standard. We are evaluating the impact of this amended guidance on our consolidated financial statements.

Reclassifications

When necessary, reclassifications have been made to our prior period financial information to conform to the current year presentation.

Landfill and Environmental Remediation Liabilities

3 Months Ended

Mar. 31, 2018

Landfill and Environmental Remediation Liabilities

Landfill and Environmental Remediation Liabilities

2. Landfill and Environmental Remediation Liabilities

Liabilities for landfill and environmental remediation costs are presented in the table below (in millions):


	March 31, 2018						December 31, 2017
			Environmental						Environmental
	Landfill		Remediation		Total		Landfill		Remediation		Total
Current (in accrued liabilities)	$	129	$	28	$	157	$	128	$	28	$	156
Long-term		1,572		223		1,795		1,547		223		1,770
	$	1,701	$	251	$	1,952	$	1,675	$	251	$	1,926

The changes to landfill and environmental remediation liabilities for the three months ended March 31, 2018 are reflected in the table below (in millions):


			Environmental
	Landfill		Remediation
December 31, 2017	$	1,675	$	251
Obligations incurred and capitalized		19		—
Obligations settled		(19)		(5)
Interest accretion		23		1
Revisions in estimates and interest rate assumptions		(9)		4
Acquisitions, divestitures and other adjustments		12		—
March 31, 2018	$	1,701	$	251

At several of our landfills, we provide financial assurance by depositing cash into restricted trust funds or escrow accounts for purposes of demonstrating our ability to meet our final capping, closure, post-closure and environmental remediation obligations. Generally, these trust funds are established to comply with statutory requirements and operating agreements. See Note 13 for additional information related to these trusts.

Debt

3 Months Ended

Mar. 31, 2018

Debt

Debt

3. Debt

The following table summarizes the major components of debt as of each balance sheet date (in millions) and provides the maturities and interest rate ranges of each major category as of March 31, 2018:


	March 31,		December 31,
	2018		2017
$2.25 billion revolving credit facility, maturing July 2020	$	28	$	—
Commercial paper program (weighted average interest rate of 2.3% as of March 31, 2018 and 1.9% as of December 31, 2017)		989		515
Canadian term loan and revolving credit facility, maturing March 2019 (weighted average effective interest rate of 2.8% as of March 31, 2018 and 2.5% as of December 31, 2017)		99		113
Senior notes, maturing through 2045, interest rates ranging from 2.4% to 7.75% (weighted average interest rate of 4.3% as of March 31, 2018 and December 31, 2017)		6,186		6,184
Tax-exempt bonds, maturing through 2045, fixed and variable interest rates ranging from 1.35% to 5.7% (weighted average interest rate of 2.1% as of March 31, 2018 and 2.0% as of December 31, 2017)		2,332		2,352
Capital leases and other, maturing through 2040, interest rates up to 12%		323		327
		9,957		9,491
Current portion of long-term debt		1,056		739
	$	8,901	$	8,752

Debt Classification

As of March 31, 2018, we had $2,180 million of debt maturing within the next 12 months, including (i) $989 million of short-term borrowings under our commercial paper program; (ii) $831 million of tax-exempt bonds with term interest rate periods that expire within the next 12 months, which is prior to their scheduled maturities; (iii) $233 million of other debt with scheduled maturities within the next 12 months, including $181 million of tax-exempt bonds; (iv) C$128 million, or $99 million, of borrowings under our Canadian term loan and (v) $28 million of borrowings under our long-term U.S. credit facility (“$2.25 billion revolving credit facility”). As of March 31, 2018, we have classified $1,124 million of this debt as long-term because we have the intent and ability to refinance these borrowings on a long-term basis as supported by the forecasted available capacity under our $2.25 billion revolving credit facility, as discussed below. The remaining $1,056 million is classified as current obligations.

As of March 31, 2018, we also have $328 million of variable-rate tax-exempt bonds that are supported by letters of credit. The interest rates on our variable-rate tax-exempt bonds are generally reset on either a daily or weekly basis through a remarketing process. All recent tax-exempt bond remarketings have successfully placed Company bonds with investors at market-driven rates and we currently expect future remarketings to be successful. However, if the remarketing agent is unable to remarket our bonds, the remarketing agent can put the bonds to us. In the event of a failed remarketing, we have the intent and ability to refinance these bonds on a long-term basis as supported by the forecasted available capacity under our $2.25 billion revolving credit facility, as discussed below. Accordingly, we have also classified these borrowings as long-term in our Condensed Consolidated Balance Sheet as of March 31, 2018.

Access to and Utilization of Credit Facilities and Commercial Paper Program

$2.25 Billion Revolving Credit Facility — Our $2.25 billion revolving credit facility maturing in July 2020 provides us with credit capacity to be used for either cash borrowings or to support letters of credit or commercial paper. The rates we pay for outstanding loans are generally based on LIBOR plus a spread depending on the Company’s debt rating assigned by Moody’s Investors Service and Standard and Poor’s. As of March 31, 2018, we had $28 million of outstanding borrowings under this facility. We had $603 million of letters of credit issued and $990 million of outstanding borrowings under our commercial paper program (excluding the related discount on issuance), both supported by this facility, leaving unused and available credit capacity of $629 million as of March 31, 2018.

Commercial Paper Program — We have a $1.5 billion commercial paper program that enables us to borrow funds for up to 397 days at competitive interest rates. The commercial paper program is fully supported by our $2.25 billion revolving credit facility. As of March 31, 2018, we had $989 million of outstanding borrowings under our commercial paper program.

Canadian Term Loan and Revolving Credit Facility — We have a Canadian credit agreement (which includes a term loan and revolving credit facility) that matures in March 2019. This agreement provides the Company (i) C$50 million of revolving credit capacity, which can be used for borrowings or letters of credit, and (ii) C$460 million of non-revolving term credit that is prepayable without penalty and principal amounts repaid may not be reborrowed. As of March 31, 2018, we had C$128 million, or $99 million, of outstanding borrowings under our Canadian term loan. As of March 31, 2018, we had no borrowings or letters of credit outstanding under the Canadian revolving credit facility.

Other Letter of Credit Facilities — As of March 31, 2018, we utilized $511 million of other letter of credit facilities, which are both committed and uncommitted, with terms maturing through April 2019.

Debt Borrowings and Repayments

$2.25 Billion Revolving Credit Facility — During the three months ended March 31, 2018, we had borrowings of $28 million under our $2.25 billion revolving credit facility for general corporate purposes.

Commercial Paper Program — During the three months ended March 31, 2018, we had net cash borrowings of $471 million (net of related discount on issuance) to support new business opportunities and for general corporate purposes.

Canadian Term Loan and Revolving Credit Facility — During the three months ended March 31, 2018, we had net repayments of C$14 million, or $11 million, of net advances under our Canadian term loan and revolving credit facility with available cash. The remaining change in the carrying value of outstanding borrowings under our Canadian term loan is due to foreign currency translation.

Tax-Exempt Bonds — During the three months ended March 31, 2018, we repaid $20 million of our tax-exempt bonds with available cash.

Capital Leases and Other — During the three months ended March 31, 2018, we made net repayments of $16 million of other debt with available cash. In addition, during the three months ended March 31, 2018, our other debt increased by $12 million primarily for debt acquired through recent acquisitions.

Operating Revenues	3 Months Ended
Operating Revenues	Mar. 31, 2018
Operating Revenues
Operating Revenues	4. Operating Revenues Our Solid Waste operating revenues are primarily generated from fees charged for our collection, transfer, disposal, and recycling and resource recovery services, and from sales of commodities by our recycling and landfill gas-to-energy operations. Revenues from our collection operations are influenced by factors such as collection frequency, type of collection equipment furnished, type and volume or weight of the waste collected, distance to the disposal facility or material recovery facility and our disposal costs. Revenues from our landfill operations consist of tipping fees, which are generally based on the type and weight or volume of waste being disposed of at our disposal facilities. Fees charged at transfer stations are generally based on the weight or volume of waste deposited, taking into account our cost of loading, transporting and disposing of the solid waste at a disposal site. Recycling revenues generally consist of tipping fees and the sale of recycling commodities to third parties. The fees we charge for our services generally include our environmental fee, fuel surcharge and regulatory recovery fee, which are intended to pass through to customers direct and indirect costs incurred. We also provide additional services that are not managed through our Solid Waste business, including operations managed by both our Strategic Business Solutions (“WMSBS”) and Energy and Environmental Services (“EES”) organizations, recycling brokerage services, landfill gas-to-energy services and certain other expanded service offerings and solutions. Our revenue from sources other than customer contracts primarily relates to lease revenue associated with compactors and balers. Revenue from these leasing arrangements was not material and represented approximately 1% of total revenue for each of the reported periods. See Note 8 for additional information related to revenue by reportable segment and major lines of business. Revenue Recognition We generally recognize revenue as services are performed or products are delivered. For example, revenue typically is recognized as waste is collected, tons are received at our landfills or transfer stations, or recycling commodities are collected or delivered as product. We bill for certain services prior to performance. Such services include, among others, certain commercial and residential contracts and equipment rentals. These advance billings are included in deferred revenues and recognized as revenue in the period service is provided. Accounts Receivable Accounts receivable, which are recorded when billed, when services are performed or when cash is advanced, are claims against third parties that will generally be settled in cash. The carrying value of our receivables, net of the allowance for doubtful accounts, represents the estimated net realizable value. We estimate our allowance for doubtful accounts based on historical collection trends; type of customer, such as municipal or commercial; the age of outstanding receivables; and existing economic conditions. If events or changes in circumstances indicate that specific receivable balances may be impaired, further consideration is given to the collectability of those balances and the allowance is adjusted accordingly. Past-due receivable balances are written off when our internal collection efforts have been unsuccessful. Deferred Revenues We record deferred revenues when cash payments are received or due in advance of our performance and classify them as current since they are earned within a year and there are no significant financing components. Substantially all our deferred revenues outstanding as of December 31, 2017 were realized as revenues within one to three months, when the related services were performed. Contract Acquisition Costs Our incremental direct costs of obtaining a contract, which consist primarily of sales incentives, are generally deferred and amortized to selling, general and administrative expense over the estimated life of the relevant customer relationship, ranging from 5 to 13 years. Contract acquisition costs that are paid to the customer are deferred and amortized as a reduction in revenue over the contract life. Our contract acquisition costs are classified as current or noncurrent based on the timing of when we expect to recognize amortization and are included in other assets in our Condensed Consolidated Balance Sheet. As of March 31, 2018, we had $136 million of deferred contract costs, of which $107 million were related to deferred sales incentives. During the three months ended March 31, 2018, we amortized $6 million of sales incentives to selling, general and administrative expense and $10 million of other contract acquisition costs as a reduction in revenue. Long-Term Contracts Approximately 30% of our total revenue is derived from contracts with an effective term greater than one year. The consideration for these contracts is variable in nature. The variable elements of these contracts primarily include the number of homes and businesses served and annual rate changes based on consumer price index, fuel prices or other operating costs. Such contracts are generally within our collection, recycling and other lines of business and have a weighted average remaining contract life of approximately four years. We do not disclose the value of unsatisfied performance obligations for these contracts as our right to consideration corresponds directly to the value provided to the customer for services completed to date and all future variable consideration is allocated to wholly unsatisfied performance obligations.

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2018
Income Taxes
Income Taxes	5. Income Taxes Our effective income tax rate for the three months ended March 31, 2018 and 2017 was 22.7% and 31.7%, respectively. We evaluate our effective income tax rate at each interim period and adjust it as facts and circumstances warrant. The decrease in the effective income tax rate for the three months ended March 31, 2018, compared with the prior year period, was primarily due to the enactment of tax reform, as discussed below. The difference between federal income taxes computed at the federal statutory rate and reported income taxes for the three months ended March 31, 2018 was primarily due to the unfavorable impact of state and local income taxes offset, in part, by the favorable impact of federal tax credits and excess tax benefits related to equity-based compensation. The difference between federal income taxes computed at the federal statutory rate and reported income taxes for the three months ended March 31, 2017 was primarily due to the favorable impact of excess tax benefits related to equity-based compensation and federal tax credits offset, in part, by the unfavorable impact of state and local income taxes and the tax implications of impairments. Enactment of Tax Reform – The Act was signed into law on December 22, 2017. The most significant impacts of the Act to the Company include a reduction in the federal corporate income tax rate from 35% to 21%, effective January 1, 2018, and a one-time, mandatory transition tax on deemed repatriation of previously tax-deferred and unremitted foreign earnings. In accordance with ASU 2018-05 and SAB 118, the Company recognized the provisional tax impacts related to the re-measurement of our deferred income tax assets and liabilities and the one-time, mandatory transition tax on deemed repatriation during the year ended December 31, 2017. As of March 31, 2018, we have not made any additional measurement-period adjustments related to these items. Such adjustments may be necessary in future periods due to, among other things, the significant complexity of the Act and anticipated additional regulatory guidance that may be issued by the Internal Revenue Service (“IRS”), changes in analysis, interpretations and assumptions the Company has made and actions the Company may take as a result of the Act. We are continuing to gather information to assess the application of the Act and expect to complete our analysis with the filing of our 2017 income tax returns during the third quarter of 2018. Equity-Based Compensation — During the three months ended March 31, 2018 and 2017, we recognized a reduction in our income tax expense of $11 million and $32 million, respectively, for excess tax benefits related to the vesting or exercise of equity-based compensation awards. Investments Qualifying for Federal Tax Credits — We have significant financial interests in entities established to invest in and manage low-income housing properties and a refined coal facility. We support the operations of these entities in exchange for a pro-rata share of the tax credits they generate. The low-income housing investments and the coal facility’s refinement processes qualify for federal tax credits that we expect to realize through 2020 under Section 42 and through 2019 under Section 45, respectively, of the Internal Revenue Code. We account for our investments in these entities using the equity method of accounting, recognizing our share of each entity’s results of operations and other reductions in the value of our investments in equity in net losses of unconsolidated entities, within our Condensed Consolidated Statements of Operations. During the three months ended March 31, 2018 and 2017, we recognized $6 million of net losses and a reduction in our income tax expense of $10 million and $11 million, respectively, primarily because of tax credits realized from these investments. Interest expense associated with our investment in low-income housing properties was not material for the periods presented. See Note 13 for additional information related to these unconsolidated variable interest entities.

Earnings Per Share

3 Months Ended

Mar. 31, 2018

Earnings Per Share

Earnings Per Share

6. Earnings Per Share

Basic and diluted earnings per share were computed using the following common share data for the three months ended March 31 (shares in millions):


	2018	2017
Number of common shares outstanding at end of period	431.8	441.9
Effect of using weighted average common shares outstanding	1.5	(0.6)
Weighted average basic common shares outstanding	433.3	441.3
Dilutive effect of equity-based compensation awards and other contingently issuable shares	2.5	2.8
Weighted average diluted common shares outstanding	435.8	444.1
Potentially issuable shares	8.2	9.2
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding	3.0	3.0

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2018
Commitments and Contingencies.
Commitments and Contingencies	7. Commitments and Contingencies Financial Instruments — We have obtained letters of credit, surety bonds and insurance policies and have established trust funds and issued financial guarantees to support tax-exempt bonds, contracts, performance of landfill final capping, closure and post-closure requirements, environmental remediation and other obligations. Letters of credit generally are supported by our $2.25 billion revolving credit facility and other credit facilities established for that purpose. These facilities are discussed further in Note 3. Surety bonds and insurance policies are supported by (i) a diverse group of third-party surety and insurance companies; (ii) an entity in which we have a noncontrolling financial interest or (iii) a wholly-owned insurance captive, the sole business of which is to issue surety bonds and/or insurance policies on our behalf. Management does not expect that any claims against or draws on these instruments would have a material adverse effect on our financial condition, results of operations or cash flows. We have not experienced any unmanageable difficulty in obtaining the required financial assurance instruments for our current operations. In an ongoing effort to mitigate risks of future cost increases and reductions in available capacity, we continue to evaluate various options to access cost-effective sources of financial assurance. Insurance — We carry insurance coverage for protection of our assets and operations from certain risks including general liability, automobile liability, workers’ compensation, real and personal property, directors’ and officers’ liability, pollution legal liability and other coverages we believe are customary to the industry. Our exposure to loss for insurance claims is generally limited to the per incident deductible under the related insurance policy. Our exposure could increase if our insurers are unable to meet their commitments on a timely basis. We have retained a significant portion of the risks related to our general liability, automobile liability and workers’ compensation claims programs. “General liability” refers to the self-insured portion of specific third-party claims made against us that may be covered under our commercial General Liability Insurance Policy. For our self-insured portions, the exposure for unpaid claims and associated expenses, including incurred but not reported losses, is based on an actuarial valuation or internal estimates. The accruals for these liabilities could be revised if future occurrences or loss development significantly differ from such valuations and estimates. In December 2017, we elected to use a wholly-owned insurance captive to insure the deductibles for our general liability, automobile liability and workers’ compensation claims programs. We do not expect the impact of any known casualty, property, environmental or other contingency to have a material impact on our financial condition, results of operations or cash flows. Guarantees — In the ordinary course of our business, WM and WM Holdings enter into guarantee agreements associated with their subsidiaries’ operations. Additionally, WM and WM Holdings have each guaranteed all of the senior debt of the other entity. No additional liabilities have been recorded for these intercompany guarantees because all of the underlying obligations are reflected in our Condensed Consolidated Balance Sheets. See Note 14 for further discussion. As of March 31, 2018, we have guaranteed the obligations and certain performance requirements of third parties in connection with both consolidated and unconsolidated entities, including (i) guarantees to cover certain market value losses for approximately 775 homeowners’ properties adjacent to or near 19 of our landfills and (ii) guarantees totaling $85 million for performance obligations of our Wheelabrator business, divested in 2014. We have also agreed to indemnify certain third-party purchasers against liabilities associated with divested operations prior to such sale. Additionally, under certain of our acquisition agreements, we have provided for additional consideration to be paid to the sellers if established financial targets or other market conditions are achieved post-closing, and we have recognized liabilities for these contingent obligations based on an estimate of the fair value of these contingencies at the time of acquisition. We do not believe that these contingent obligations will have a material adverse effect on the Company’s financial condition, results of operations or cash flows, and we do not expect the financial impact of operational and financial performance guarantees to materially exceed the recorded fair value. Environmental Matters — A significant portion of our operating costs and capital expenditures could be characterized as costs of environmental protection. The nature of our operations, particularly with respect to the construction, operation and maintenance of our landfills, subjects us to an array of laws and regulations relating to the protection of the environment. Under current laws and regulations, we may have liabilities for environmental damage caused by our operations, or for damage caused by conditions that existed before we acquired a site. In addition to remediation activity required by state or local authorities, such liabilities include potentially responsible party (“PRP”) investigations. The costs associated with these liabilities can include settlements, certain legal and consultant fees, as well as incremental internal and external costs directly associated with site investigation and clean-up. Estimating our degree of responsibility for remediation is inherently difficult. We recognize and accrue for an estimated remediation liability when we determine that such liability is both probable and reasonably estimable. Determining the method and ultimate cost of remediation requires that a number of assumptions be made. There can sometimes be a range of reasonable estimates of the costs associated with the likely site remediation alternatives identified in the environmental impact investigation. In these cases, we use the amount within the range that is our best estimate. If no amount within a range appears to be a better estimate than any other, we use the amount that is the low end of such range. If we used the high ends of such ranges, our aggregate potential liability would be approximately $145 million higher than the $251 million recorded in the Condensed Consolidated Balance Sheet as of March 31, 2018. Our ultimate responsibility may differ materially from current estimates. It is possible that technological, regulatory or enforcement developments, the results of environmental studies, the inability to identify other PRPs, the inability of other PRPs to contribute to the settlements of such liabilities, or other factors could require us to record additional liabilities. Our ongoing review of our remediation liabilities, in light of relevant internal and external facts and circumstances, could result in revisions to our accruals that could cause upward or downward adjustments to our balance sheet and income from operations. These adjustments could be material in any given period. As of March 31, 2018, we have been notified by the government that we are a PRP in connection with 75 locations listed on the Environmental Protection Agency’s (“EPA’s”) Superfund National Priorities List (“NPL”). Of the 75 sites at which claims have been made against us, 15 are sites we own. Each of the NPL sites we own was initially developed by others as a landfill disposal facility. At each of these facilities, we are working in conjunction with the government to evaluate or remediate identified site problems, and we have either agreed with other legally liable parties on an arrangement for sharing the costs of remediation or are working toward a cost-sharing agreement. We generally expect to receive any amounts due from other participating parties at or near the time that we make the remedial expenditures. The other 60 NPL sites, which we do not own, are at various procedural stages under the Comprehensive Environmental Response, Compensation and Liability Act of 1980, as amended, known as CERCLA or Superfund. The majority of proceedings involving NPL sites that we do not own are based on allegations that certain of our subsidiaries (or their predecessors) transported hazardous substances to the sites, often prior to our acquisition of these subsidiaries. CERCLA generally provides for liability for those parties owning, operating, transporting to or disposing at the sites. Proceedings arising under Superfund typically involve numerous waste generators and other waste transportation and disposal companies and seek to allocate or recover costs associated with site investigation and remediation, which costs could be substantial and could have a material adverse effect on our consolidated financial statements. At some of the sites at which we have been identified as a PRP, our liability is well defined as a consequence of a governmental decision and an agreement among liable parties as to the share each will pay for implementing that remedy. At other sites, where no remedy has been selected or the liable parties have been unable to agree on an appropriate allocation, our future costs are uncertain. On October 11, 2017, the EPA issued its Record of Decision (“ROD”) with respect to the previously proposed remediation plan for the San Jacinto waste pits in Harris County, Texas. McGinnes Industrial Maintenance Corporation (“MIMC”), an indirect wholly-owned subsidiary of WM, operated some of the waste pits from 1965 to 1966 and has been named as a site PRP. In 1998, WM acquired the stock of the parent entity of MIMC. MIMC has been working with the EPA and other named PRPs as the process of addressing the site proceeds. On April 9, 2018, MIMC and International Paper Company entered into an Administrative Order on Consent agreement with the EPA to develop a remedial design for the EPA’s selected remedy for the site. Allocation of responsibility among the PRPs for the selected remedy has not been established. As of March 31, 2018 and December 31, 2017, the recorded liability for MIMC’s estimated potential share of the EPA’s selected remedy and related costs was $55 million. MIMC’s ultimate liability could be materially different from current estimates. Item 103 of the SEC’s Regulation S-K requires disclosure of certain environmental matters when a governmental authority is a party to the proceedings, or such proceedings are known to be contemplated, unless we reasonably believe that the matter will result in no monetary sanctions, or in monetary sanctions, exclusive of interest and costs, of less than $100,000. The following matters are disclosed in accordance with that requirement. We do not currently believe that the eventual outcome of any such matters, individually or in the aggregate, could have a material adverse effect on the Company’s business, financial condition, results of operations or cash flows. On January 10, 2017, the Pennsylvania Department of Environmental Protection (“DEP”) solid waste program advised us that it would seek civil penalties against the Grows North and Tullytown Landfills (“Grows/Tullytown”), located in southeast Pennsylvania and owned by indirect wholly-owned subsidiaries of WM, related to operational issues, including litter and leachate discharges. We received additional notice on March 15, 2017 that the DEP clean water program would seek civil penalties related to similar underlying events and operational issues at Grows/Tullytown. We engaged in discussions with representatives of the DEP and amicably resolved these issues, and on March 26, 2018, we signed a consent assessment of civil penalty and subsequently made payment of $505,100. On July 10, 2013, the EPA issued a Notice of Violation ("NOV") to Waste Management of Wisconsin, Inc., an indirect wholly-owned subsidiary of WM, alleging violations of the Resource Conservation Recovery Act concerning acceptance of certain waste that was not permitted to be disposed of at the Metro Recycling & Disposal Facility in Franklin, Wisconsin. The parties are exchanging information and working to resolve the NOV. The Hawaii Department of Health and the EPA have asserted civil penalty claims against Waste Management of Hawaii, Inc. (“WMHI”), an indirect wholly-owned subsidiary of WM, based on stormwater discharges at the Waimanalo Gulch Sanitary Landfill following two major rainstorms in December 2010 and January 2011 and alleged violations of stormwater permit requirements prior to and after the storms. WMHI operates the landfill for the City and County of Honolulu. From time to time, we are also named as defendants in personal injury and property damage lawsuits, including purported class actions, on the basis of having owned, operated or transported waste to a disposal facility that is alleged to have contaminated the environment or, in certain cases, on the basis of having conducted environmental remediation activities at sites. Some of the lawsuits may seek to have us pay the costs of monitoring of allegedly affected sites and health care examinations of allegedly affected persons for a substantial period of time even where no actual damage is proven. While we believe we have meritorious defenses to these lawsuits, the ultimate resolution is often substantially uncertain due to the difficulty of determining the cause, extent and impact of alleged contamination (which may have occurred over a long period of time), the potential for successive groups of complainants to emerge, the diversity of the individual plaintiffs’ circumstances, and the potential contribution or indemnification obligations of co-defendants or other third parties, among other factors. Additionally, we often enter into agreements with landowners imposing obligations on us to meet certain regulatory or contractual conditions upon site closure or upon termination of the agreements. Compliance with these agreements inherently involves subjective determinations and may result in disputes, including litigation. Litigation — As a large company with operations across the U.S. and Canada, we are subject to various proceedings, lawsuits, disputes and claims arising in the ordinary course of our business. Many of these actions raise complex factual and legal issues and are subject to uncertainties. Actions that have been filed against us, and that may be filed against us in the future, include personal injury, property damage, commercial, customer, and employment-related claims, including purported state and national class action lawsuits related to: alleged environmental contamination, including releases of hazardous material and odors; sales and marketing practices, customer service agreements and prices and fees; and federal and state wage and hour and other laws. The plaintiffs in some actions seek unspecified damages or injunctive relief, or both. These actions are in various procedural stages, and some are covered, in part, by insurance. We currently do not believe that the eventual outcome of any such actions will have a material adverse effect on the Company’s business, financial condition, results of operations or cash flows. WM’s charter and bylaws provide that WM shall indemnify against all liabilities and expenses, and upon request shall advance expenses to any person, who is subject to a pending or threatened proceeding because such person is or was a director or officer of the Company. Such indemnification is required to the maximum extent permitted under Delaware law. Accordingly, the director or officer must execute an undertaking to reimburse the Company for any fees advanced if it is later determined that the director or officer was not permitted to have such fees advanced under Delaware law. Additionally, the Company has direct contractual obligations to provide indemnification to each of the members of WM’s Board of Directors and each of WM’s executive officers. The Company may incur substantial expenses in connection with the fulfillment of its advancement of costs and indemnification obligations in connection with actions or proceedings that may be brought against its former or current officers, directors and employees. Multiemployer Defined Benefit Pension Plans — About 20% of our workforce is covered by collective bargaining agreements with various local unions across the U.S. and Canada. As a result of some of these agreements, certain of our subsidiaries are participating employers in a number of trustee-managed multiemployer defined benefit pension plans (“Multiemployer Pension Plans”) for the covered employees. In connection with our ongoing renegotiation of various collective bargaining agreements, we may discuss and negotiate for the complete or partial withdrawal from one or more of these Multiemployer Pension Plans. A complete or partial withdrawal from a Multiemployer Pension Plan may also occur if employees covered by a collective bargaining agreement vote to decertify a union from continuing to represent them. Any other circumstance resulting in a decline in Company contributions to a Multiemployer Pension Plan through a reduction in the labor force, whether through attrition over time or through a business event (such as the discontinuation or nonrenewal of a customer contract, the decertification of a union, or relocation, reduction or discontinuance of certain operations) may also trigger a complete or partial withdrawal from one or more of these pension plans. We do not believe that any future liability relating to our past or current participation in, or withdrawals from, the Multiemployer Pension Plans to which we contribute will have a material adverse effect on our business, financial condition or liquidity. However, liability for future withdrawals could have a material adverse effect on our results of operations or cash flows for a particular reporting period, depending on the number of employees withdrawn and the financial condition of the Multiemployer Pension Plan(s) at the time of such withdrawal(s). Tax Matters — We participate in the IRS’s Compliance Assurance Process, which means we work with the IRS throughout the year towards resolving any material issues prior to the filing of our annual tax return. Any unresolved issues as of the tax return filing date are subject to routine examination procedures. We are currently in the examination phase of IRS audits for the 2014 through 2018 tax years and expect these audits to be completed within the next 24 months. We are also currently undergoing audits by various state and local jurisdictions for tax years that date back to 2011, with the exception of affirmative claims in a limited number of jurisdictions that date back to 2000. We maintain a liability for uncertain tax positions, the balance of which management believes is adequate. Results of audit assessments by taxing authorities are not currently expected to have a material adverse effect on our financial condition, results of operations or cash flows.

Segment and Related Information

3 Months Ended

Mar. 31, 2018

Segment and Related Information

Segment and Related Information

8. Segment and Related Information

We evaluate, oversee and manage the financial performance of our Solid Waste business subsidiaries through our 17 Areas. The 17 Areas constitute our operating segments and we have evaluated the aggregation criteria and concluded that, based on the similarities between our Areas, including the fact that our Solid Waste business is homogenous across geographies with the same services offered across the Areas, aggregation of our Areas is appropriate for purposes of presenting our reportable segments. Accordingly, we have aggregated our 17 Areas into three tiers that we believe have similar economic characteristics and future prospects based in large part on a review of the Areas’ income from operations margins. The economic variations experienced by our Areas are attributable to a variety of factors, including regulatory environment of the Area; economic environment of the Area, including level of commercial and industrial activity; population density; service offering mix and disposal logistics, with no one factor being singularly determinative of an Area’s current or future economic performance.

Annually, we analyze the Areas’ income from operations margins for purposes of segment reporting and in the fourth quarter of 2017, we realigned our Solid Waste tiers to reflect changes in their relative economic characteristics and prospects. These changes are the results of various factors including acquisitions, divestments, business mix and the economic climate of various geographies. Reclassifications have been made to our prior period consolidated financial information to conform to the current year presentation.

Tier 1 is comprised of our operations across the Southern U.S., with the exception of Southern California and the Florida peninsula, and also includes the New England states, the tri-state area of Michigan, Indiana and Ohio, and Western Canada. Tier 2 now includes Southern California, Eastern Canada, Wisconsin and Minnesota. Tier 3 now encompasses all the remaining operations including the Pacific Northwest and Northern California, the Mid-Atlantic region of the U.S., the Florida peninsula, Illinois and Missouri.

The operating segments not evaluated and overseen through the 17 Areas are presented herein as “Other” as these operating segments do not meet the criteria to be aggregated with other operating segments and do not meet the quantitative criteria to be separately reported.

Summarized financial information concerning our reportable segments for the three months ended March 31 is shown in the following table (in millions):


	Gross		Intercompany		Net		Income
	Operating		Operating		Operating		from
	Revenues		Revenues		Revenues		Operations
2018
Solid Waste:
Tier 1	$	1,373	$	(241)	$	1,132	$	365
Tier 2		613		(111)		502		122
Tier 3		1,633		(309)		1,324		291
Solid Waste		3,619		(661)		2,958		778
Other		607		(54)		553		(23)
		4,226		(715)		3,511		755
Corporate and Other		—		—		—		(147)
Total	$	4,226	$	(715)	$	3,511	$	608

2017
Solid Waste:
Tier 1	$	1,340	$	(238)	$	1,102	$	366
Tier 2		592		(101)		491		116
Tier 3		1,577		(285)		1,292		268
Solid Waste		3,509		(624)		2,885		750
Other		603		(48)		555		(32)
		4,112		(672)		3,440		718
Corporate and Other		—		—		—		(160)
Total	$	4,112	$	(672)	$	3,440	$	558

The mix of operating revenues from our major lines of business for the three months ended March 31 are as follows (in millions):


	2018		2017
Commercial	$	955	$	911
Residential		614		621
Industrial		637		603
Other		101		100
Total collection		2,307		2,235
Landfill		805		739
Transfer		375		366
Recycling		312		372
Other (a)		427		400
Intercompany (b)		(715)		(672)
Total	$	3,511	$	3,440

(a)

The “Other” line of business includes (i) our WMSBS organization; (ii) our landfill gas-to-energy operations; (iii) certain services within our EES organization, including our construction and remediation services and our services associated with the disposal of fly ash and (iv) certain other expanded service offerings and solutions. In addition, our “Other” line of business reflects the results of non-operating entities that provide financial assurance and self-insurance support, net of intercompany activity.

(b)

Intercompany revenues between lines of business are eliminated in the Condensed Consolidated Financial Statements included within this report.

Fluctuations in our operating results may be caused by many factors, including period-to-period changes in the relative contribution of revenue by each line of business, changes in commodity prices and general economic conditions. In addition, our revenues and income from operations typically reflect seasonal patterns. Our operating revenues tend to be somewhat higher in summer months, primarily due to the higher construction and demolition waste volumes. The volumes of industrial and residential waste in certain regions where we operate also tend to increase during the summer months. Our second and third quarter revenues and results of operations typically reflect these seasonal trends.

Service disruptions caused by severe storms, extended periods of inclement weather or climate extremes resulting from climate change can significantly affect the operating results of the Areas affected. On the other hand, certain destructive weather conditions that tend to occur during the second half of the year, such as the hurricanes that most often impact our operations in the Southern and Eastern U.S., can increase our revenues in the Areas affected. While weather-related and other event driven special projects can boost revenues through additional work for a limited time, as a result of significant start-up costs and other factors, such revenue can generate earnings at comparatively lower margins.

Acquisitions	3 Months Ended
Acquisitions	Mar. 31, 2018
Acquisitions
Acquisitions	9. Acquisitions During the three months ended March 31, 2018, we acquired seven solid waste businesses. Total consideration, net of cash acquired, for these acquisitions was $246 million. The businesses acquired provide collection, transfer and disposal services. As of March 31, 2018, the allocation of the purchase price for these acquisitions is preliminary; fair value estimates of identifiable assets acquired and liabilities assumed are based on management’s estimates, judgments and assumptions and are subject to change until finalized.

Accumulated Other Comprehensive Income (Loss)

3 Months Ended

Mar. 31, 2018

Accumulated Other Comprehensive Income (Loss)

Accumulated Other Comprehensive Income (Loss)

10. Accumulated Other Comprehensive Income (Loss)

The changes in the balances of each component of accumulated other comprehensive income (loss), net of tax, which is included as a component of Waste Management, Inc. stockholders’ equity, are as follows (in millions, with amounts in parentheses representing decreases to accumulated other comprehensive income):


					Foreign		Post-
			Available-		Currency		Retirement
	Derivative		for-Sale		Translation		Benefit
	Instruments		Securities		Adjustments		Obligations		Total
Balance, December 31, 2017	$	(33)	$	15	$	29	$	(3)	$	8
Other comprehensive income (loss) before reclassifications, net of tax expense (benefit) of $0, $0, $0 and $0, respectively		—		(1)		(32)		—		(33)
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax (expense) benefit of $1, $0, $0 and $0, respectively		2		—		—		—		2
Net current period other comprehensive income (loss)		2		(1)		(32)		—		(31)
Adoption of new accounting standard (a)		(7)		3		—		(1)		(5)
Balance, March 31, 2018	$	(38)	$	17	$	(3)	$	(4)	$	(28)

(a)

As of January 1, 2018, we adopted ASU 2018-02 and reclassified stranded tax effects to retained earnings. See Note 1 for further discussion of ASU 2018-02.

There have been no derivatives outstanding subsequent to March 31, 2016. Amounts reclassified out of each component of accumulated other comprehensive income (loss) associated with our previously terminated cash flow hedges were not material for the periods presented.

Common Stock Repurchase Program	3 Months Ended
Common Stock Repurchase Program	Mar. 31, 2018
Common Stock Repurchase Program
Common Stock Repurchase Program	11. Common Stock Repurchase Program The Company repurchases shares of its common stock as part of capital allocation programs authorized by our Board of Directors. In February 2018, we entered into an accelerated share repurchase (“ASR”) agreement to repurchase $250 million of our common stock. At the beginning of the repurchase period, we delivered $250 million in cash and received 2.3 million shares based on a stock price of $85.13. This agreement was completed in March 2018 and we received 0.6 million additional shares. The final weighted average per share price for the completed ASR agreement was $85.15. In March 2018, after completion of the ASR agreement, we repurchased 0.1 million additional shares in open market transactions under a 10b5-1 plan for $8 million, inclusive of per-share commissions, and made payment in April 2018. We account for ASR agreements as two separate transactions: (i) as shares of reacquired common stock for the shares delivered to us upon effectiveness of the ASR agreement and (ii) as a forward contract indexed to our own common stock for the undelivered shares. The initial delivery of shares is included in treasury stock at cost and results in an immediate reduction of the outstanding shares used to calculate the weighted average common shares outstanding for basic and diluted earnings per share. The forward contracts indexed to our own common stock meet the criteria for equity classification, and these amounts are initially recorded in additional paid-in capital and reclassified to treasury stock upon completion of the ASR agreement. As of March 31, 2018, the Company has authorization for $992 million of future share repurchases. Any future share repurchases pursuant to this authorization of our Board of Directors will be made at the discretion of management and will depend on factors similar to those considered by the Board of Directors in making dividend declarations, including our net earnings, financial condition and cash required for future business plans.

Fair Value Measurements

3 Months Ended

Mar. 31, 2018

Fair Value Measurements

Fair Value Measurements

12. Fair Value Measurements

Assets and Liabilities Accounted for at Fair Value

Our assets and liabilities that are measured at fair value on a recurring basis include the following (in millions):


			Fair Value Measurements Using
			Quoted		Significant
			Prices in		Other		Significant
			Active		Observable		Unobservable
			Markets		Inputs		Inputs
	Total		(Level 1)		(Level 2)		(Level 3)(a)
March 31, 2018
Assets:
Money market funds	$	125	$	125	$	—	$	—
Available-for-sale securities		49		—		49		—
Fixed-income securities		47		—		47		—
Redeemable preferred stock		56		—		—		56
Total assets	$	277	$	125	$	96	$	56

December 31, 2017
Assets:
Money market funds	$	225	$	225	$	—	$	—
Available-for-sale securities		49		—		49		—
Fixed-income securities		47		—		47		—
Redeemable preferred stock		55		—		—		55
Total assets	$	376	$	225	$	96	$	55

(a)

When available, Level 3 investments have been measured based on third-party investors’ recent or pending transactions in these securities, which are considered the best evidence of fair value. When this evidence is not available, we use other valuation techniques as appropriate and available. These valuation methodologies may include transactions in similar instruments, discounted cash flow techniques, third-party appraisals or industry multiples and public comparables. There has not been any significant change in the fair value of the redeemable preferred stock since our assessment as of December 31, 2017.

Fair Value of Debt

As of March 31, 2018 and December 31, 2017, the carrying value of our debt was $10.0 billion and $9.5 billion, respectively. The estimated fair value of our debt was approximately $10.1 billion and $9.9 billion as of March 31, 2018 and December 31, 2017, respectively.

Although we have determined the estimated fair value amounts using available market information and commonly accepted valuation methodologies, considerable judgment is required in interpreting market data to develop the estimates of fair value. Accordingly, our estimates are not necessarily indicative of the amounts that we, or holders of the instruments, could realize in a current market exchange. The use of different assumptions or estimation methodologies could have a material effect on the estimated fair values. The fair value estimates are based on Level 2 inputs of the fair value hierarchy available as of March 31, 2018 and December 31, 2017. These amounts have not been revalued since those dates, and current estimates of fair value could differ significantly from the amounts presented.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Variable Interest Entities	3 Months Ended
Variable Interest Entities	Mar. 31, 2018
Variable Interest Entities
Variable Interest Entities	13. Variable Interest Entities Following is a description of our financial interests in unconsolidated and consolidated variable interest entities that we consider significant: Low-Income Housing Properties and Refined Coal Facility Investments We do not consolidate our investments in entities established to manage low-income housing properties and a refined coal facility as we have determined we are not the primary beneficiary of these entities as we do not have the power to individually direct the activities of these entities. Accordingly, we account for these investments under the equity method of accounting. Our aggregate investment balance in these two entities was $59 million as of March 31, 2018 and December 31, 2017. The debt balance related to our investment in low-income housing properties was $28 million and $34 million as of March 31, 2018 and December 31, 2017, respectively. Additional information related to these investments is discussed in Note 5. Trust Funds for Final Capping, Closure, Post-Closure or Environmental Remediation Obligations Unconsolidated Variable Interest Entities — Trust funds that are established for both the benefit of the Company and the host community in which we operate are not consolidated because we are not the primary beneficiary of these entities as we either do not have the (i) power to direct the significant activities of the trusts or (ii) power over the trusts’ significant activities is shared. Our interests in these trusts are accounted for as investments in unconsolidated entities and receivables. These amounts are recorded in other receivables, investments in unconsolidated entities and long-term other assets in our Condensed Consolidated Balance Sheets, as appropriate. We also reflect our share of the unrealized gains and losses on available-for-sale securities held by these trusts as a component of our accumulated other comprehensive income (loss). Our investments and receivables related to these trusts had an aggregate carrying value of $98 million and $99 million as of March 31, 2018 and December 31, 2017, respectively. Consolidated Variable Interest Entities — Trust funds for which we are the sole beneficiary are consolidated because we are the primary beneficiary. These trust funds are recorded in restricted trust and escrow accounts in our Condensed Consolidated Balance Sheets. Unrealized gains and losses on available-for-sale securities held by these trusts are recorded as a component of our accumulated other comprehensive income (loss). These trusts had a fair value of $102 million and $101 million as of March 31, 2018 and December 31, 2017, respectively.

Condensed Consolidating Financial Statements

3 Months Ended

Mar. 31, 2018

Condensed Consolidating Financial Statements

Condensed Consolidating Financial Statements

14. Condensed Consolidating Financial Statements

WM Holdings has fully and unconditionally guaranteed all of WM’s senior indebtedness. WM has fully and unconditionally guaranteed all of WM Holdings’ senior indebtedness. None of WM’s other subsidiaries have guaranteed any of WM’s or WM Holdings’ debt. As a result of these guarantee arrangements, we are required to present the following condensed consolidating financial information (in millions):

CONDENSED CONSOLIDATING BALANCE SHEETS

March 31, 2018

(Unaudited)


			WM		Non-Guarantor
	WM		Holdings		Subsidiaries		Eliminations		Consolidated
ASSETS
Current assets:
Cash and cash equivalents	$	—	$	—	$	52	$	—	$	52
Other current assets		139		5		2,295		—		2,439
		139		5		2,347		—		2,491
Property and equipment, net		—		—		11,637		—		11,637
Investments in affiliates		22,878		23,351		—		(46,229)		—
Advances to affiliates		—		—		15,398		(15,398)		—
Other assets		5		31		7,942		—		7,978
Total assets	$	23,022	$	23,387	$	37,324	$	(61,627)	$	22,106

LIABILITIES AND EQUITY
Current liabilities:
Current portion of long-term debt	$	544	$	—	$	512	$	—	$	1,056
Accounts payable and other current liabilities		76		3		2,238		—		2,317
		620		3		2,750		—		3,373
Long-term debt, less current portion		6,954		304		1,643		—		8,901
Due to affiliates		15,472		203		6,073		(21,748)		—
Other liabilities		5		—		3,762		—		3,767
Total liabilities		23,051		510		14,228		(21,748)		16,041
Equity:
Stockholders’ equity		6,044		22,877		23,352		(46,229)		6,044
Advances to affiliates		(6,073)		—		(277)		6,350		—
Noncontrolling interests		—		—		21		—		21
		(29)		22,877		23,096		(39,879)		6,065
Total liabilities and equity	$	23,022	$	23,387	$	37,324	$	(61,627)	$	22,106

CONDENSED CONSOLIDATING BALANCE SHEETS (Continued)

December 31, 2017


			WM		Non-Guarantor
	WM		Holdings		Subsidiaries		Eliminations		Consolidated
ASSETS
Current assets:
Cash and cash equivalents	$	—	$	—	$	22	$	—	$	22
Other current assets		5		5		2,592		—		2,602
		5		5		2,614		—		2,624
Property and equipment, net		—		—		11,559		—		11,559
Investments in affiliates		22,393		22,893		—		(45,286)		—
Advances to affiliates		—		—		15,349		(15,349)		—
Other assets		9		31		7,606		—		7,646
Total assets	$	22,407	$	22,929	$	37,128	$	(60,635)	$	21,829

LIABILITIES AND EQUITY
Current liabilities:
Current portion of long-term debt	$	537	$	—	$	202	$	—	$	739
Accounts payable and other current liabilities		55		9		2,459		—		2,523
		592		9		2,661		—		3,262
Long-term debt, less current portion		6,457		304		1,991		—		8,752
Due to affiliates		15,404		224		6,073		(21,701)		—
Other liabilities		8		—		3,765		—		3,773
Total liabilities		22,461		537		14,490		(21,701)		15,787
Equity:
Stockholders’ equity		6,019		22,392		22,894		(45,286)		6,019
Advances to affiliates		(6,073)		—		(279)		6,352		—
Noncontrolling interests		—		—		23		—		23
		(54)		22,392		22,638		(38,934)		6,042
Total liabilities and equity	$	22,407	$	22,929	$	37,128	$	(60,635)	$	21,829

CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS

Three Months Ended March 31, 2018

(Unaudited)


			WM		Non‑Guarantor
	WM		Holdings		Subsidiaries		Eliminations		Consolidated
Operating revenues	$	—	$	—	$	3,555	$	(44)	$	3,511
Costs and expenses		44		—		2,903		(44)		2,903
Income from operations		(44)		—		652		—		608
Other income (expense):
Interest expense, net		(76)		(5)		(10)		—		(91)
Equity in earnings of subsidiaries, net of tax		485		489		—		(974)		—
Other, net		—		—		(6)		—		(6)
		409		484		(16)		(974)		(97)
Income before income taxes		365		484		636		(974)		511
Income tax expense (benefit)		(31)		(1)		148		—		116
Consolidated net income		396		485		488		(974)		395
Less: Net loss attributable to noncontrolling interests		—		—		(1)		—		(1)
Net income attributable to Waste Management, Inc.	$	396	$	485	$	489	$	(974)	$	396

Three Months Ended March 31, 2017

(Unaudited)


			WM		Non‑Guarantor
	WM		Holdings		Subsidiaries		Eliminations		Consolidated
Operating revenues	$	—	$	—	$	3,440	$	—	$	3,440
Costs and expenses		—		—		2,882		—		2,882
Income from operations		—		—		558		—		558
Other income (expense):
Interest expense, net		(74)		(5)		(13)		—		(92)
Equity in earnings of subsidiaries, net of tax		343		346		—		(689)		—
Other, net		—		—		(32)		—		(32)
		269		341		(45)		(689)		(124)
Income before income taxes		269		341		513		(689)		434
Income tax expense (benefit)		(29)		(2)		168		—		137
Consolidated net income		298		343		345		(689)		297
Less: Net loss attributable to noncontrolling interests		—		—		(1)		—		(1)
Net income attributable to Waste Management, Inc.	$	298	$	343	$	346	$	(689)	$	298

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited)


			WM		Non-Guarantor
	WM		Holdings		Subsidiaries		Eliminations		Consolidated
Three Months Ended March 31:
2018
Comprehensive income	$	398	$	485	$	455	$	(974)	$	364
Less: Comprehensive loss attributable to noncontrolling interests		—		—		(1)		—		(1)
Comprehensive income attributable to Waste Management, Inc.	$	398	$	485	$	456	$	(974)	$	365

2017
Comprehensive income	$	300	$	343	$	357	$	(689)	$	311
Less: Comprehensive loss attributable to noncontrolling interests		—		—		(1)		—		(1)
Comprehensive income attributable to Waste Management, Inc.	$	300	$	343	$	358	$	(689)	$	312

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

Three Months Ended March 31, 2018

(Unaudited)


			WM		Non-Guarantor
	WM(a)		Holdings(a)		Subsidiaries(a)		Eliminations		Consolidated
Cash flows provided by (used in):
Operating activities	$	—	$	—	$	809	$	—	$	809
Investing activities		—		—		(637)		—		(637)
Financing activities		—		—		(38)		—		(38)
Effect of exchange rate changes on cash, cash equivalents and restricted cash and cash equivalents		—		—		(1)		—		(1)
Intercompany activity		—		—		—		—		—
Increase in cash, cash equivalents and restricted cash and cash equivalents		—		—		133		—		133
Cash, cash equivalents and restricted cash and cash equivalents at beginning of period		—		—		293		—		293
Cash, cash equivalents and restricted cash and cash equivalents at end of period	$	—	$	—	$	426	$	—	$	426

Three Months Ended March 31, 2017

(Unaudited)


			WM		Non-Guarantor
	WM(a)		Holdings(a)		Subsidiaries(a)		Eliminations		Consolidated
Cash flows provided by (used in):
Operating activities	$	—	$	—	$	722	$	—	$	722
Investing activities		—		—		(337)		—		(337)
Financing activities		—		—		(385)		—		(385)
Effect of exchange rate changes on cash, cash equivalents and restricted cash and cash equivalents		—		—		—		—		—
Intercompany activity		—		—		—		—		—
Increase in cash, cash equivalents and restricted cash and cash equivalents		—		—		—		—		—
Cash, cash equivalents and restricted cash and cash equivalents at beginning of period		—		—		94		—		94
Cash, cash equivalents and restricted cash and cash equivalents at end of period	$	—	$	—	$	94	$	—	$	94

(a)

Cash receipts and payments of WM and WM Holdings are transacted by Non-Guarantor Subsidiaries.

Basis of Presentation (Policies)

3 Months Ended

Mar. 31, 2018

Basis of Presentation

Basis of Presentation

Adoption of New Accounting Standards and New Accounting Standards Pending Adoption

Adoption of New Accounting Standards

New Accounting Standards Pending Adoption

Reclassifications

When necessary, reclassifications have been made to our prior period financial information to conform to the current year presentation.

Landfill and Environmental Remediation Liabilities (Tables)

3 Months Ended

Mar. 31, 2018

Landfill and Environmental Remediation Liabilities

Liabilities for Landfill and Environmental Remediation Costs

Liabilities for landfill and environmental remediation costs are presented in the table below (in millions):


	March 31, 2018						December 31, 2017
			Environmental						Environmental
	Landfill		Remediation		Total		Landfill		Remediation		Total
Current (in accrued liabilities)	$	129	$	28	$	157	$	128	$	28	$	156
Long-term		1,572		223		1,795		1,547		223		1,770
	$	1,701	$	251	$	1,952	$	1,675	$	251	$	1,926

Changes to Landfill and Environmental Remediation Liabilities

The changes to landfill and environmental remediation liabilities for the three months ended March 31, 2018 are reflected in the table below (in millions):


			Environmental
	Landfill		Remediation
December 31, 2017	$	1,675	$	251
Obligations incurred and capitalized		19		—
Obligations settled		(19)		(5)
Interest accretion		23		1
Revisions in estimates and interest rate assumptions		(9)		4
Acquisitions, divestitures and other adjustments		12		—
March 31, 2018	$	1,701	$	251

Debt (Tables)

3 Months Ended

Mar. 31, 2018

Debt

Components of Debt


	March 31,		December 31,
	2018		2017
$2.25 billion revolving credit facility, maturing July 2020	$	28	$	—
Commercial paper program (weighted average interest rate of 2.3% as of March 31, 2018 and 1.9% as of December 31, 2017)		989		515
Canadian term loan and revolving credit facility, maturing March 2019 (weighted average effective interest rate of 2.8% as of March 31, 2018 and 2.5% as of December 31, 2017)		99		113
Senior notes, maturing through 2045, interest rates ranging from 2.4% to 7.75% (weighted average interest rate of 4.3% as of March 31, 2018 and December 31, 2017)		6,186		6,184
Tax-exempt bonds, maturing through 2045, fixed and variable interest rates ranging from 1.35% to 5.7% (weighted average interest rate of 2.1% as of March 31, 2018 and 2.0% as of December 31, 2017)		2,332		2,352
Capital leases and other, maturing through 2040, interest rates up to 12%		323		327
		9,957		9,491
Current portion of long-term debt		1,056		739
	$	8,901	$	8,752

Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share

Common Share Data Used for Computing Basic and Diluted Earnings Per Share

Basic and diluted earnings per share were computed using the following common share data for the three months ended March 31 (shares in millions):


	2018	2017
Number of common shares outstanding at end of period	431.8	441.9
Effect of using weighted average common shares outstanding	1.5	(0.6)
Weighted average basic common shares outstanding	433.3	441.3
Dilutive effect of equity-based compensation awards and other contingently issuable shares	2.5	2.8
Weighted average diluted common shares outstanding	435.8	444.1
Potentially issuable shares	8.2	9.2
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding	3.0	3.0

Segment and Related Information (Tables)

3 Months Ended

Mar. 31, 2018

Segment and Related Information

Reportable Segments

Summarized financial information concerning our reportable segments for the three months ended March 31 is shown in the following table (in millions):


	Gross		Intercompany		Net		Income
	Operating		Operating		Operating		from
	Revenues		Revenues		Revenues		Operations
2018
Solid Waste:
Tier 1	$	1,373	$	(241)	$	1,132	$	365
Tier 2		613		(111)		502		122
Tier 3		1,633		(309)		1,324		291
Solid Waste		3,619		(661)		2,958		778
Other		607		(54)		553		(23)
		4,226		(715)		3,511		755
Corporate and Other		—		—		—		(147)
Total	$	4,226	$	(715)	$	3,511	$	608

2017
Solid Waste:
Tier 1	$	1,340	$	(238)	$	1,102	$	366
Tier 2		592		(101)		491		116
Tier 3		1,577		(285)		1,292		268
Solid Waste		3,509		(624)		2,885		750
Other		603		(48)		555		(32)
		4,112		(672)		3,440		718
Corporate and Other		—		—		—		(160)
Total	$	4,112	$	(672)	$	3,440	$	558

Summary of operating revenues mix

The mix of operating revenues from our major lines of business for the three months ended March 31 are as follows (in millions):


	2018		2017
Commercial	$	955	$	911
Residential		614		621
Industrial		637		603
Other		101		100
Total collection		2,307		2,235
Landfill		805		739
Transfer		375		366
Recycling		312		372
Other (a)		427		400
Intercompany (b)		(715)		(672)
Total	$	3,511	$	3,440

(a)

(b)

Intercompany revenues between lines of business are eliminated in the Condensed Consolidated Financial Statements included within this report.

Accumulated Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2018

Accumulated Other Comprehensive Income (Loss)

Components of Accumulated Other Comprehensive Income (Loss)


					Foreign		Post-
			Available-		Currency		Retirement
	Derivative		for-Sale		Translation		Benefit
	Instruments		Securities		Adjustments		Obligations		Total
Balance, December 31, 2017	$	(33)	$	15	$	29	$	(3)	$	8
Other comprehensive income (loss) before reclassifications, net of tax expense (benefit) of $0, $0, $0 and $0, respectively		—		(1)		(32)		—		(33)
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax (expense) benefit of $1, $0, $0 and $0, respectively		2		—		—		—		2
Net current period other comprehensive income (loss)		2		(1)		(32)		—		(31)
Adoption of new accounting standard (a)		(7)		3		—		(1)		(5)
Balance, March 31, 2018	$	(38)	$	17	$	(3)	$	(4)	$	(28)

(a)

As of January 1, 2018, we adopted ASU 2018-02 and reclassified stranded tax effects to retained earnings. See Note 1 for further discussion of ASU 2018-02.

Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2018

Fair Value Measurements

Fair Value of Assets and Liabilities Measured on Recurring Basis

Our assets and liabilities that are measured at fair value on a recurring basis include the following (in millions):


			Fair Value Measurements Using
			Quoted		Significant
			Prices in		Other		Significant
			Active		Observable		Unobservable
			Markets		Inputs		Inputs
	Total		(Level 1)		(Level 2)		(Level 3)(a)
March 31, 2018
Assets:
Money market funds	$	125	$	125	$	—	$	—
Available-for-sale securities		49		—		49		—
Fixed-income securities		47		—		47		—
Redeemable preferred stock		56		—		—		56
Total assets	$	277	$	125	$	96	$	56

December 31, 2017
Assets:
Money market funds	$	225	$	225	$	—	$	—
Available-for-sale securities		49		—		49		—
Fixed-income securities		47		—		47		—
Redeemable preferred stock		55		—		—		55
Total assets	$	376	$	225	$	96	$	55

Condensed Consolidating Financial Statements (Tables)

3 Months Ended

Mar. 31, 2018

Condensed Consolidating Financial Statements

Condensed Consolidating Balance Sheets

CONDENSED CONSOLIDATING BALANCE SHEETS

March 31, 2018

(Unaudited)


			WM		Non-Guarantor
	WM		Holdings		Subsidiaries		Eliminations		Consolidated
ASSETS
Current assets:
Cash and cash equivalents	$	—	$	—	$	52	$	—	$	52
Other current assets		139		5		2,295		—		2,439
		139		5		2,347		—		2,491
Property and equipment, net		—		—		11,637		—		11,637
Investments in affiliates		22,878		23,351		—		(46,229)		—
Advances to affiliates		—		—		15,398		(15,398)		—
Other assets		5		31		7,942		—		7,978
Total assets	$	23,022	$	23,387	$	37,324	$	(61,627)	$	22,106

LIABILITIES AND EQUITY
Current liabilities:
Current portion of long-term debt	$	544	$	—	$	512	$	—	$	1,056
Accounts payable and other current liabilities		76		3		2,238		—		2,317
		620		3		2,750		—		3,373
Long-term debt, less current portion		6,954		304		1,643		—		8,901
Due to affiliates		15,472		203		6,073		(21,748)		—
Other liabilities		5		—		3,762		—		3,767
Total liabilities		23,051		510		14,228		(21,748)		16,041
Equity:
Stockholders’ equity		6,044		22,877		23,352		(46,229)		6,044
Advances to affiliates		(6,073)		—		(277)		6,350		—
Noncontrolling interests		—		—		21		—		21
		(29)		22,877		23,096		(39,879)		6,065
Total liabilities and equity	$	23,022	$	23,387	$	37,324	$	(61,627)	$	22,106

CONDENSED CONSOLIDATING BALANCE SHEETS (Continued)

December 31, 2017


			WM		Non-Guarantor
	WM		Holdings		Subsidiaries		Eliminations		Consolidated
ASSETS
Current assets:
Cash and cash equivalents	$	—	$	—	$	22	$	—	$	22
Other current assets		5		5		2,592		—		2,602
		5		5		2,614		—		2,624
Property and equipment, net		—		—		11,559		—		11,559
Investments in affiliates		22,393		22,893		—		(45,286)		—
Advances to affiliates		—		—		15,349		(15,349)		—
Other assets		9		31		7,606		—		7,646
Total assets	$	22,407	$	22,929	$	37,128	$	(60,635)	$	21,829

LIABILITIES AND EQUITY
Current liabilities:
Current portion of long-term debt	$	537	$	—	$	202	$	—	$	739
Accounts payable and other current liabilities		55		9		2,459		—		2,523
		592		9		2,661		—		3,262
Long-term debt, less current portion		6,457		304		1,991		—		8,752
Due to affiliates		15,404		224		6,073		(21,701)		—
Other liabilities		8		—		3,765		—		3,773
Total liabilities		22,461		537		14,490		(21,701)		15,787
Equity:
Stockholders’ equity		6,019		22,392		22,894		(45,286)		6,019
Advances to affiliates		(6,073)		—		(279)		6,352		—
Noncontrolling interests		—		—		23		—		23
		(54)		22,392		22,638		(38,934)		6,042
Total liabilities and equity	$	22,407	$	22,929	$	37,128	$	(60,635)	$	21,829

Condensed Consolidating Statements of Operations

CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS

Three Months Ended March 31, 2018

(Unaudited)


			WM		Non‑Guarantor
	WM		Holdings		Subsidiaries		Eliminations		Consolidated
Operating revenues	$	—	$	—	$	3,555	$	(44)	$	3,511
Costs and expenses		44		—		2,903		(44)		2,903
Income from operations		(44)		—		652		—		608
Other income (expense):
Interest expense, net		(76)		(5)		(10)		—		(91)
Equity in earnings of subsidiaries, net of tax		485		489		—		(974)		—
Other, net		—		—		(6)		—		(6)
		409		484		(16)		(974)		(97)
Income before income taxes		365		484		636		(974)		511
Income tax expense (benefit)		(31)		(1)		148		—		116
Consolidated net income		396		485		488		(974)		395
Less: Net loss attributable to noncontrolling interests		—		—		(1)		—		(1)
Net income attributable to Waste Management, Inc.	$	396	$	485	$	489	$	(974)	$	396

Three Months Ended March 31, 2017

(Unaudited)


			WM		Non‑Guarantor
	WM		Holdings		Subsidiaries		Eliminations		Consolidated
Operating revenues	$	—	$	—	$	3,440	$	—	$	3,440
Costs and expenses		—		—		2,882		—		2,882
Income from operations		—		—		558		—		558
Other income (expense):
Interest expense, net		(74)		(5)		(13)		—		(92)
Equity in earnings of subsidiaries, net of tax		343		346		—		(689)		—
Other, net		—		—		(32)		—		(32)
		269		341		(45)		(689)		(124)
Income before income taxes		269		341		513		(689)		434
Income tax expense (benefit)		(29)		(2)		168		—		137
Consolidated net income		298		343		345		(689)		297
Less: Net loss attributable to noncontrolling interests		—		—		(1)		—		(1)
Net income attributable to Waste Management, Inc.	$	298	$	343	$	346	$	(689)	$	298

Condensed Consolidating Statements of Comprehensive Income

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited)


			WM		Non-Guarantor
	WM		Holdings		Subsidiaries		Eliminations		Consolidated
Three Months Ended March 31:
2018
Comprehensive income	$	398	$	485	$	455	$	(974)	$	364
Less: Comprehensive loss attributable to noncontrolling interests		—		—		(1)		—		(1)
Comprehensive income attributable to Waste Management, Inc.	$	398	$	485	$	456	$	(974)	$	365

2017
Comprehensive income	$	300	$	343	$	357	$	(689)	$	311
Less: Comprehensive loss attributable to noncontrolling interests		—		—		(1)		—		(1)
Comprehensive income attributable to Waste Management, Inc.	$	300	$	343	$	358	$	(689)	$	312

Condensed Consolidating Statements of Cash Flows

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

Three Months Ended March 31, 2018

(Unaudited)


			WM		Non-Guarantor
	WM(a)		Holdings(a)		Subsidiaries(a)		Eliminations		Consolidated
Cash flows provided by (used in):
Operating activities	$	—	$	—	$	809	$	—	$	809
Investing activities		—		—		(637)		—		(637)
Financing activities		—		—		(38)		—		(38)
Effect of exchange rate changes on cash, cash equivalents and restricted cash and cash equivalents		—		—		(1)		—		(1)
Intercompany activity		—		—		—		—		—
Increase in cash, cash equivalents and restricted cash and cash equivalents		—		—		133		—		133
Cash, cash equivalents and restricted cash and cash equivalents at beginning of period		—		—		293		—		293
Cash, cash equivalents and restricted cash and cash equivalents at end of period	$	—	$	—	$	426	$	—	$	426

Three Months Ended March 31, 2017

(Unaudited)


			WM		Non-Guarantor
	WM(a)		Holdings(a)		Subsidiaries(a)		Eliminations		Consolidated
Cash flows provided by (used in):
Operating activities	$	—	$	—	$	722	$	—	$	722
Investing activities		—		—		(337)		—		(337)
Financing activities		—		—		(385)		—		(385)
Effect of exchange rate changes on cash, cash equivalents and restricted cash and cash equivalents		—		—		—		—		—
Intercompany activity		—		—		—		—		—
Increase in cash, cash equivalents and restricted cash and cash equivalents		—		—		—		—		—
Cash, cash equivalents and restricted cash and cash equivalents at beginning of period		—		—		94		—		94
Cash, cash equivalents and restricted cash and cash equivalents at end of period	$	—	$	—	$	94	$	—	$	94

Cash receipts and payments of WM and WM Holdings are transacted by Non-Guarantor Subsidiaries.

Basis of Presentation - Revenue (Detail) $ in Millions	3 Months Ended
Basis of Presentation - Revenue (Detail) $ in Millions	Mar. 31, 2018 USD ($) segment	Jan. 01, 2018 USD ($)	Dec. 31, 2017 USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Number of areas \| segment	17
Retained earnings	$ 8,867		$ 8,588
Contract acquisition costs	136
Deferred income taxes	$ 1,258		$ 1,248
Accounting Standards Update 2014-09 [Member] \| Impact of adoption [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings		$ 80
Contract acquisition costs		108
Deferred income taxes		$ 28

Basis of Presentation (Detail) - USD ($) $ in Millions	Jan. 01, 2018	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
New ASU
Restricted trust and escrow accounts		$ 422	$ 319
Accounting Standards Update 2016-01 [Member]
New ASU
Equity investments without readily determinable fair values		$ 87
Accounting Standards Update 2016-15 [Member]
New ASU
Restricted trust and escrow accounts			$ 271	$ 64	$ 62
Accounting Standards Update 2018-02 [Member]
New ASU
Adoption of new accounting standard	$ (5)

Landfill and Environmental Remediation Liabilities - Summary (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Landfill and environmental remediation liabilities
Total, Environmental Remediation	$ 251
Current (in accrued liabilities)	157	$ 156
Long-term	1,795	1,770
Total	1,952	1,926
Landfill [Member]
Landfill and environmental remediation liabilities
Current (in accrued liabilities), Landfill	129	128
Long-term, Landfill	1,572	1,547
Total, Landfill	1,701	1,675
Environmental Remediation Liabilities [Member]
Landfill and environmental remediation liabilities
Current (in accrued liabilities), Environmental Remediation	28	28
Long-term, Environmental Remediation	223	223
Total, Environmental Remediation	$ 251	$ 251

Landfill and Environmental Remediation Liabilities - Changes (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Landfill and environmental remediation liabilities
Interest accretion	$ 23	$ 22
Ending balance, environmental remediation	251
Landfill [Member]
Landfill and environmental remediation liabilities
Beginning balance, landfill	1,675
Obligations incurred and capitalized	19
Obligations settled	(19)
Interest accretion	23
Revisions in estimates and interest rate assumptions	(9)
Acquisitions, divestitures and other adjustments	12
Ending balance, landfill	1,701
Environmental Remediation Liabilities [Member]
Landfill and environmental remediation liabilities
Beginning balance, environmental remediation	251
Obligations settled	(5)
Interest accretion	1
Revisions in estimates and interest rate assumptions	4
Ending balance, environmental remediation	251
San Jacinto Waste Pits [Member]
Landfill and environmental remediation liabilities
Beginning balance, environmental remediation	55
Ending balance, environmental remediation	$ 55

Debt - Components of Debt (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Debt
Debt and capital lease obligations	$ 9,957	$ 9,491
Current portion of long-term debt	1,056	739
Long-term debt, less current portion	8,901	8,752
Revolving Credit Facility [Member]
Debt
Debt and capital lease obligations	28
Current portion of long-term debt	28
Credit Facility, aggregate capacity	2,250
Commercial Paper Program [Member]
Debt
Debt and capital lease obligations	989	$ 515
Current portion of long-term debt	989
Credit Facility, aggregate capacity	$ 1,500
Weighted average interest rate	2.30%	1.90%
Canadian Term Loan and Revolving Credit Facility [Member]
Debt
Debt and capital lease obligations	$ 99	$ 113
Weighted average interest rate	2.80%	2.50%
Senior Notes, Aggregate [Member]
Debt
Debt and capital lease obligations	$ 6,186	$ 6,184
Weighted average interest rate	4.30%	4.30%
Tax Exempt Bonds [Member]
Debt
Debt and capital lease obligations	$ 2,332	$ 2,352
Current portion of long-term debt	$ 181
Weighted average interest rate	2.10%	2.00%
Capital Leases and Other [Member]
Debt
Debt and capital lease obligations	$ 323	$ 327
Minimum [Member] \| Senior Notes, Aggregate [Member]
Debt
Interest rate	2.40%
Minimum [Member] \| Tax Exempt Bonds [Member]
Debt
Interest rate	1.35%
Maximum [Member] \| Senior Notes, Aggregate [Member]
Debt
Interest rate	7.75%
Maximum [Member] \| Tax Exempt Bonds [Member]
Debt
Interest rate	5.70%
Maximum [Member] \| Capital Leases and Other [Member]
Debt
Interest rate	12.00%

Debt - Classification and Utilization (Detail) $ in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018 CAD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Debt
Debt maturing within twelve months		$ 2,180
Current portion of long-term debt		1,056	$ 739
Debt classified as long-term due to intent and ability to refinance on long-term basis		1,124
Commercial Paper Program [Member]
Debt
Current portion of long-term debt		989
Maximum capacity		1,500
Debt, before unamortized (discount) premium		990
Debt term	397 days
Tax Exempt Bonds [Member]
Debt
Current portion of long-term debt		181
Debt with interest rate periods that expiring in the next 12 months		831
Variable-rate tax-exempt bonds		328
Revolving Credit Facility [Member]
Debt
Current portion of long-term debt		28
Maximum capacity		2,250
Outstanding borrowings under credit facility		28
Letters of credit outstanding		603
Unused and available credit capacity		629
Canadian Revolving Credit Facility [Member]
Debt
Maximum capacity	$ 50
Outstanding borrowings under credit facility		0
Letters of credit outstanding		0
Canadian Term Loan [Member]
Debt
Current portion of long-term debt	128	99
Outstanding borrowings under credit facility	128	99
Maximum term credit	$ 460
Other Letter of Credit Facilities [Member]
Debt
Letters of credit outstanding		511
Other Debt [Member]
Debt
Current portion of long-term debt		$ 233

Debt - Borrowings and Repayments (Detail) $ in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018 CAD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)
Debt
Net commercial paper borrowings		$ 471	$ 210
Debt repayments		80	541
New borrowings		61	$ 54
Commercial Paper Program [Member]
Debt
Net line of credit proceeds (repayments)		471
Capital Leases and Other [Member]
Debt
Net debt borrowings (repayments)		16
New borrowings		12
Canadian Term Loan [Member]
Debt
Debt repayments	$ 14	11
Tax Exempt Bonds [Member]
Debt
Debt repayments		$ 20
Minimum [Member] \| Senior Notes, Aggregate [Member]
Debt
Interest rate	2.40%	2.40%
Minimum [Member] \| Tax Exempt Bonds [Member]
Debt
Interest rate	1.35%	1.35%
Maximum [Member] \| Capital Leases and Other [Member]
Debt
Interest rate	12.00%	12.00%
Maximum [Member] \| Senior Notes, Aggregate [Member]
Debt
Interest rate	7.75%	7.75%
Maximum [Member] \| Tax Exempt Bonds [Member]
Debt
Interest rate	5.70%	5.70%

Operating Revenues (Details) - USD ($) $ in Millions	3 Months Ended
Operating Revenues (Details) - USD ($) $ in Millions	Mar. 31, 2018	Mar. 31, 2017
Contract Acquisition Costs
Revenue other than customer contracts (as a percent)	1.00%	1.00%
Deferred contract costs	$ 136
Long-term revenue contracts (as a percent)	30.00%
Weighted average remaining contract term	4 years
Deferred Sales Incentives [Member]
Contract Acquisition Costs
Deferred contract costs	$ 107
Selling, General and Administrative Expenses [Member]
Contract Acquisition Costs
Deferred contract costs amortization	6
Reduction to Sales [Member]
Contract Acquisition Costs
Deferred contract costs amortization	$ 10
Minimum [Member]
Contract Acquisition Costs
Contract amortization period	5 years
Maximum [Member]
Contract Acquisition Costs
Contract amortization period	13 years

Income Taxes - Quarter information (Detail) - USD ($) $ in Millions		3 Months Ended		12 Months Ended
	Jan. 01, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Taxes
Effective tax rate of income (loss) before income taxes		22.70%	31.70%
Income tax expense at U.S. federal statutory rate	21.00%			35.00%
Deferred income tax benefits included in income tax expense		$ 11	$ 32
Equity in net losses of unconsolidated entities		7	32
Investments Qualifying for Federal Tax Credits [Member]
Income Taxes
Equity in net losses of unconsolidated entities		6	6
Income tax (expense) benefit, including tax credits, from equity method investment		$ 10	$ 11

Earnings Per Share (Detail) - shares shares in Millions	3 Months Ended
Earnings Per Share (Detail) - shares shares in Millions	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share
Number of common shares outstanding at year-end	431.8	441.9
Effect of using weighted average common shares outstanding	1.5	(0.6)
Weighted average basic common shares outstanding	433.3	441.3
Dilutive effect of equity-based compensation awards and other contingently issuable shares	2.5	2.8
Weighted average diluted common shares outstanding	435.8	444.1
Potentially issuable shares	8.2	9.2
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding	3.0	3.0

Commitments and Contingencies - Other (Details)		2 Months Ended	3 Months Ended
Commitments and Contingencies - Other (Details)	Mar. 26, 2018 USD ($)	Jan. 31, 2011 item	Mar. 31, 2018 USD ($) site item	Dec. 31, 2017 USD ($)
Commitments And Contingencies [Line Items]
Approximate number of homeowners' properties adjacent to or near certain of our landfills with agreements guaranteeing market value \| item			775
Number of landfills adjacent to or near homeowners' properties with agreements guaranteeing market value \| item			19
Environmental remediation reasonably possible additional losses high estimate			$ 145,000,000
Environmental remediation liabilities			$ 251,000,000
Number of sites listed on the EPA's NPL for which we have been notified we are a PRP \| site			75
Number of owned sites listed on the EPA's NPL for which we have been notified we are a PRP \| site			15
Number of non-owned sites listed on the EPA's NPL for which we have been notified we are a PRP \| site			60
Dollar threshold for environmental matters requiring disclosure under item 103 of the SEC's Regulation S-K			$ 100,000
Approximate percentage of workforce covered by collective bargaining agreements			20.00%
Expected time of completion of IRS audits			24 months
San Jacinto Waste Pits [Member]
Commitments And Contingencies [Line Items]
Environmental remediation liabilities			$ 55,000,000	$ 55,000,000
Grows North and Tullytown Landfills [Member]
Commitments And Contingencies [Line Items]
Obligations settled	$ 505,100
Waimanalo Gulch Sanitary Landfill
Commitments And Contingencies [Line Items]
Number of major rainfalls \| item		2
Wheelabrator [Member]
Commitments And Contingencies [Line Items]
Maximum future payments			$ 85,000,000

Segment and Related Information - Information (Detail)	3 Months Ended
Segment and Related Information - Information (Detail)	Mar. 31, 2018 area segment
Segment Reporting Information [Line Items]
Number of areas	17
Solid Waste [Member]
Segment Reporting Information [Line Items]
Number of areas \| area	17
Number of reportable segments	3

Segment and Related Information - Summary (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Operating revenues	$ 3,511	$ 3,440
Income from operations	608	558
Operating Group Total [Member]
Segment Reporting Information [Line Items]
Operating revenues	3,511	3,440
Income from operations	755	718
Solid Waste [Member]
Segment Reporting Information [Line Items]
Operating revenues	2,958	2,885
Income from operations	778	750
Tier 1 [Member]
Segment Reporting Information [Line Items]
Operating revenues	1,132	1,102
Income from operations	365	366
Tier 2 [Member]
Segment Reporting Information [Line Items]
Operating revenues	502	491
Income from operations	122	116
Tier 3 [Member]
Segment Reporting Information [Line Items]
Operating revenues	1,324	1,292
Income from operations	291	268
Other [Member]
Segment Reporting Information [Line Items]
Operating revenues	553	555
Income from operations	(23)	(32)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating revenues	4,226	4,112
Operating Segments [Member] \| Operating Group Total [Member]
Segment Reporting Information [Line Items]
Operating revenues	4,226	4,112
Operating Segments [Member] \| Solid Waste [Member]
Segment Reporting Information [Line Items]
Operating revenues	3,619	3,509
Operating Segments [Member] \| Tier 1 [Member]
Segment Reporting Information [Line Items]
Operating revenues	1,373	1,340
Operating Segments [Member] \| Tier 2 [Member]
Segment Reporting Information [Line Items]
Operating revenues	613	592
Operating Segments [Member] \| Tier 3 [Member]
Segment Reporting Information [Line Items]
Operating revenues	1,633	1,577
Operating Segments [Member] \| Other [Member]
Segment Reporting Information [Line Items]
Operating revenues	607	603
Intercompany Operating Revenues [Member]
Segment Reporting Information [Line Items]
Operating revenues	(715)	(672)
Intercompany Operating Revenues [Member] \| Operating Group Total [Member]
Segment Reporting Information [Line Items]
Operating revenues	(715)	(672)
Intercompany Operating Revenues [Member] \| Solid Waste [Member]
Segment Reporting Information [Line Items]
Operating revenues	(661)	(624)
Intercompany Operating Revenues [Member] \| Tier 1 [Member]
Segment Reporting Information [Line Items]
Operating revenues	(241)	(238)
Intercompany Operating Revenues [Member] \| Tier 2 [Member]
Segment Reporting Information [Line Items]
Operating revenues	(111)	(101)
Intercompany Operating Revenues [Member] \| Tier 3 [Member]
Segment Reporting Information [Line Items]
Operating revenues	(309)	(285)
Intercompany Operating Revenues [Member] \| Other [Member]
Segment Reporting Information [Line Items]
Operating revenues	(54)	(48)
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Income from operations	$ (147)	$ (160)

Segment and Related Information - Revenues mix (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue from External Customer [Line Items]
Operating revenues	$ 3,511	$ 3,440
Operating Segments [Member]
Revenue from External Customer [Line Items]
Operating revenues	4,226	4,112
Operating Segments [Member] \| Collection [Member]
Revenue from External Customer [Line Items]
Operating revenues	2,307	2,235
Operating Segments [Member] \| Commercial [Member]
Revenue from External Customer [Line Items]
Operating revenues	955	911
Operating Segments [Member] \| Residential [Member]
Revenue from External Customer [Line Items]
Operating revenues	614	621
Operating Segments [Member] \| Industrial [Member]
Revenue from External Customer [Line Items]
Operating revenues	637	603
Operating Segments [Member] \| Other Collection [Member]
Revenue from External Customer [Line Items]
Operating revenues	101	100
Operating Segments [Member] \| Landfill [Member]
Revenue from External Customer [Line Items]
Operating revenues	805	739
Operating Segments [Member] \| Transfer [Member]
Revenue from External Customer [Line Items]
Operating revenues	375	366
Operating Segments [Member] \| Recycling [Member]
Revenue from External Customer [Line Items]
Operating revenues	312	372
Operating Segments [Member] \| Other Revenue [Member]
Revenue from External Customer [Line Items]
Operating revenues	427	400
Intercompany Operating Revenues [Member]
Revenue from External Customer [Line Items]
Operating revenues	$ (715)	$ (672)

Acquisitions (Detail) $ in Millions	3 Months Ended
Acquisitions (Detail) $ in Millions	Mar. 31, 2018 USD ($) item
Acquisitions
Number of business acquired \| item	7
Consideration, net of cash acquired, for business acquisitions \| $	$ 246

Accumulated Other Comprehensive Loss - Changes (Detail) - USD ($) $ in Millions		3 Months Ended
	Jan. 01, 2018	Mar. 31, 2018	Mar. 31, 2017
AOCI roll forward
Beginning balance	$ 6,042	$ 6,042
Other comprehensive income (loss), net of tax		(31)	$ 14
Ending balance		6,065
Accumulated Other Comprehensive Loss [Member]
AOCI roll forward
Beginning balance	8	8
Other comprehensive income (loss) before reclassifications, net of tax		(33)
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax		2
Other comprehensive income (loss), net of tax		(31)
Ending balance		(28)
Derivative Instruments [Member]
AOCI roll forward
Beginning balance	(33)	(33)
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax		2
Other comprehensive income (loss), net of tax		2
Ending balance		(38)
Available for sale Securities [Member]
AOCI roll forward
Beginning balance	15	15
Other comprehensive income (loss) before reclassifications, net of tax		(1)
Other comprehensive income (loss), net of tax		(1)
Ending balance		17
Foreign Currency Translation Adjustments [Member]
AOCI roll forward
Beginning balance	29	29
Other comprehensive income (loss) before reclassifications, net of tax		(32)
Other comprehensive income (loss), net of tax		(32)
Ending balance		(3)
Post - Retirement Benefit Obligation [Member]
AOCI roll forward
Beginning balance	(3)	(3)
Ending balance		(4)
Accounting Standards Update 2018-02 [Member]
AOCI roll forward
Adoption of new accounting standard	$ (5)
Accounting Standards Update 2018-02 [Member] \| Accumulated Other Comprehensive Loss [Member]
AOCI roll forward
Adoption of new accounting standard		(5)
Accounting Standards Update 2018-02 [Member] \| Derivative Instruments [Member]
AOCI roll forward
Adoption of new accounting standard		(7)
Accounting Standards Update 2018-02 [Member] \| Available for sale Securities [Member]
AOCI roll forward
Adoption of new accounting standard		3
Accounting Standards Update 2018-02 [Member] \| Post - Retirement Benefit Obligation [Member]
AOCI roll forward
Adoption of new accounting standard		$ (1)

Accumulated Other Comprehensive Loss - Tax Impact (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, tax	$ 0
Amounts reclassified from accumulated other comprehensive (income) loss, tax	1
Available for sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, tax	0
Amounts reclassified from accumulated other comprehensive (income) loss, tax	0
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, tax	0
Amounts reclassified from accumulated other comprehensive (income) loss, tax	0
Post - Retirement Benefit Obligation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, tax	0
Amounts reclassified from accumulated other comprehensive (income) loss, tax	$ 0

Accumulated Other Comprehensive Income (Loss) - Derivative (Detail) $ in Millions	Mar. 31, 2016 USD ($)
Derivative Instruments [Member] \| Foreign Currency Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Outstanding derivatives	$ 0

Common Stock Repurchase Program (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended		3 Months Ended
	Mar. 31, 2018	Feb. 28, 2018	Mar. 31, 2018	Dec. 31, 2017
Accelerated Share Repurchases [Line Items]
Common stock repurchases			$ 258
Cash paid for repurchase of common stock			250
Accrued liabilities	$ 1,031		1,031	$ 980
Authorized share repurchases	$ 992		992
Accelerated Share Repurchase Agreement (ASR) [Member]
Accelerated Share Repurchases [Line Items]
Common stock repurchases		$ 250
Cash paid for repurchase of common stock		$ 250
Shares repurchased	0.6	2.3
ASR price (dollars per share)		$ 85.13
Weighted average per share purchase price	$ 85.15
10b5-1 Plan [Member]
Accelerated Share Repurchases [Line Items]
Shares repurchased	0.1
Accrued liabilities	$ 8		$ 8

Fair Value Measurements - Recurring (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	$ 277	$ 376
Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	125	225
Available-for-sale Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	49	49
Fixed-Income Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	47	47
Redeemable Preferred Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	56	55
Quoted Prices in Active Markets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	125	225
Quoted Prices in Active Markets (Level 1) [Member] \| Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	125	225
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	96	96
Significant Other Observable Inputs (Level 2) [Member] \| Available-for-sale Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	49	49
Significant Other Observable Inputs (Level 2) [Member] \| Fixed-Income Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	47	47
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	56	55
Significant Unobservable Inputs (Level 3) [Member] \| Redeemable Preferred Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	$ 56	$ 55

Fair Value Measurements - Debt (Detail) - USD ($) $ in Billions	Mar. 31, 2018	Dec. 31, 2017
Reported Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of Debt	$ 10.0	$ 9.5
Significant Other Observable Inputs (Level 2) [Member] \| Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of Debt	$ 10.1	$ 9.9

Variable Interest Entities (Detail) $ in Millions	3 Months Ended
Variable Interest Entities (Detail) $ in Millions	Mar. 31, 2018 USD ($) item	Dec. 31, 2017 USD ($)
Variable Interest Entity, Not Primary Beneficiary [Member] \| Other Receivables Investments in Unconsolidated Entities and Other Assets [Member]
Variable Interest Entity [Line Items]
Aggregate investment balance	$ 98	$ 99
Investments Qualifying for Federal Tax Credits [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Number of variable interest entities \| item	2
Aggregate investment balance	$ 59	59
Investment In Low Income Housing Properties [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Equity method investments debt balance	28	34
Trust For Final Capping, Closure, Post-closure Or Environmental Remediation Obligations [Member] \| Variable Interest Entity, Primary Beneficiary [Member] \| Long-term other assets [Member]
Variable Interest Entity [Line Items]
Value of consolidated VIEs	$ 102	$ 101

Condensed Consolidating Financial Statements - Balance Sheets (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Current assets:
Cash and cash equivalents	$ 52	$ 22	$ 30
Other current assets	2,439	2,602
Total current assets	2,491	2,624
Property and equipment, net	11,637	11,559
Other assets	7,978	7,646
Total assets	22,106	21,829
Current liabilities:
Current portion of long-term debt	1,056	739
Accounts payable and other current liabilities	2,317	2,523
Total current liabilities	3,373	3,262
Long-term debt, less current portion	8,901	8,752
Other liabilities	3,767	3,773
Total liabilities	16,041	15,787
Equity:
Stockholders' equity	6,044	6,019
Noncontrolling interests	21	23
Total equity	6,065	6,042
Total liabilities and equity	22,106	21,829
Eliminations [Member]
Current assets:
Investments in affiliates	(46,229)	(45,286)
Advances to affiliates	(15,398)	(15,349)
Total assets	(61,627)	(60,635)
Current liabilities:
Due to affiliates	(21,748)	(21,701)
Total liabilities	(21,748)	(21,701)
Equity:
Stockholders' equity	(46,229)	(45,286)
Advances to affiliates	6,350	6,352
Total equity	(39,879)	(38,934)
Total liabilities and equity	(61,627)	(60,635)
WM [Member] \| Reportable Legal Entities [Member]
Current assets:
Other current assets	139	5
Total current assets	139	5
Investments in affiliates	22,878	22,393
Other assets	5	9
Total assets	23,022	22,407
Current liabilities:
Current portion of long-term debt	544	537
Accounts payable and other current liabilities	76	55
Total current liabilities	620	592
Long-term debt, less current portion	6,954	6,457
Due to affiliates	15,472	15,404
Other liabilities	5	8
Total liabilities	23,051	22,461
Equity:
Stockholders' equity	6,044	6,019
Advances to affiliates	(6,073)	(6,073)
Total equity	(29)	(54)
Total liabilities and equity	23,022	22,407
WM Holdings [Member] \| Reportable Legal Entities [Member]
Current assets:
Other current assets	5	5
Total current assets	5	5
Investments in affiliates	23,351	22,893
Other assets	31	31
Total assets	23,387	22,929
Current liabilities:
Accounts payable and other current liabilities	3	9
Total current liabilities	3	9
Long-term debt, less current portion	304	304
Due to affiliates	203	224
Total liabilities	510	537
Equity:
Stockholders' equity	22,877	22,392
Total equity	22,877	22,392
Total liabilities and equity	23,387	22,929
Non-Guarantor Subsidiaries [Member] \| Reportable Legal Entities [Member]
Current assets:
Cash and cash equivalents	52	22
Other current assets	2,295	2,592
Total current assets	2,347	2,614
Property and equipment, net	11,637	11,559
Advances to affiliates	15,398	15,349
Other assets	7,942	7,606
Total assets	37,324	37,128
Current liabilities:
Current portion of long-term debt	512	202
Accounts payable and other current liabilities	2,238	2,459
Total current liabilities	2,750	2,661
Long-term debt, less current portion	1,643	1,991
Due to affiliates	6,073	6,073
Other liabilities	3,762	3,765
Total liabilities	14,228	14,490
Equity:
Stockholders' equity	23,352	22,894
Advances to affiliates	(277)	(279)
Noncontrolling interests	21	23
Total equity	23,096	22,638
Total liabilities and equity	$ 37,324	$ 37,128

Condensed Consolidating Financial Statements - Statements of Operations (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Condensed Income Statements, Captions [Line Items]
Operating revenues	$ 3,511	$ 3,440
Costs and expenses	2,903	2,882
Income from operations	608	558
Other income (expense):
Interest expense, net	(91)	(92)
Other, net	(6)	(32)
Total other income (expense)	(97)	(124)
Income before income taxes	511	434
Income tax expense (benefit)	116	137
Consolidated net income	395	297
Less: Net loss attributable to noncontrolling interests	(1)	(1)
Net income attributable to Waste Management, Inc.	396	298
Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Operating revenues	(44)
Costs and expenses	(44)
Other income (expense):
Equity in earnings of subsidiaries, net of tax	(974)	(689)
Total other income (expense)	(974)	(689)
Income before income taxes	(974)	(689)
Consolidated net income	(974)	(689)
Net income attributable to Waste Management, Inc.	(974)	(689)
WM [Member] \| Reportable Legal Entities [Member]
Condensed Income Statements, Captions [Line Items]
Costs and expenses	44
Income from operations	(44)
Other income (expense):
Interest expense, net	(76)	(74)
Equity in earnings of subsidiaries, net of tax	485	343
Total other income (expense)	409	269
Income before income taxes	365	269
Income tax expense (benefit)	(31)	(29)
Consolidated net income	396	298
Net income attributable to Waste Management, Inc.	396	298
WM Holdings [Member] \| Reportable Legal Entities [Member]
Other income (expense):
Interest expense, net	(5)	(5)
Equity in earnings of subsidiaries, net of tax	489	346
Total other income (expense)	484	341
Income before income taxes	484	341
Income tax expense (benefit)	(1)	(2)
Consolidated net income	485	343
Net income attributable to Waste Management, Inc.	485	343
Non-Guarantor Subsidiaries [Member] \| Reportable Legal Entities [Member]
Condensed Income Statements, Captions [Line Items]
Operating revenues	3,555	3,440
Costs and expenses	2,903	2,882
Income from operations	652	558
Other income (expense):
Interest expense, net	(10)	(13)
Other, net	(6)	(32)
Total other income (expense)	(16)	(45)
Income before income taxes	636	513
Income tax expense (benefit)	148	168
Consolidated net income	488	345
Less: Net loss attributable to noncontrolling interests	(1)	(1)
Net income attributable to Waste Management, Inc.	$ 489	$ 346

Condensed Consolidating Financial Statements - Statements of Comprehensive Income (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Condensed Statement Of Income Captions [Line Items]
Comprehensive income	$ 364	$ 311
Less: Comprehensive loss attributable to noncontrolling interests	(1)	(1)
Comprehensive income attributable to Waste Management, Inc.	365	312
Eliminations [Member]
Condensed Statement Of Income Captions [Line Items]
Comprehensive income	(974)	(689)
Comprehensive income attributable to Waste Management, Inc.	(974)	(689)
WM [Member] \| Reportable Legal Entities [Member]
Condensed Statement Of Income Captions [Line Items]
Comprehensive income	398	300
Comprehensive income attributable to Waste Management, Inc.	398	300
WM Holdings [Member] \| Reportable Legal Entities [Member]
Condensed Statement Of Income Captions [Line Items]
Comprehensive income	485	343
Comprehensive income attributable to Waste Management, Inc.	485	343
Non-Guarantor Subsidiaries [Member] \| Reportable Legal Entities [Member]
Condensed Statement Of Income Captions [Line Items]
Comprehensive income	455	357
Less: Comprehensive loss attributable to noncontrolling interests	(1)	(1)
Comprehensive income attributable to Waste Management, Inc.	$ 456	$ 358

Condensed Consolidating Financial Statements - Cash Flows (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Condensed Cash Flow Statements Captions [Line Items]
Operating activities	$ 809	$ 722
Investing activities	(637)	(337)
Financing activities	(38)	(385)
Effect of exchange rate changes on cash, cash equivalents and restricted cash and cash equivalents	(1)
Increase in cash, cash equivalents and restricted cash and cash equivalents	133
Cash, cash equivalents and restricted cash and cash equivalents at beginning of period	293	94
Cash, cash equivalents and restricted cash and cash equivalents at end of period	426	94
Non-Guarantor Subsidiaries [Member] \| Reportable Legal Entities [Member]
Condensed Cash Flow Statements Captions [Line Items]
Operating activities	809	722
Investing activities	(637)	(337)
Financing activities	(38)	(385)
Effect of exchange rate changes on cash, cash equivalents and restricted cash and cash equivalents	(1)
Increase in cash, cash equivalents and restricted cash and cash equivalents	133
Cash, cash equivalents and restricted cash and cash equivalents at beginning of period	293	94
Cash, cash equivalents and restricted cash and cash equivalents at end of period	$ 426	$ 94