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Condensed Consolidating Financial Statements - Statements of Comprehensive Income (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Condensed Statement Of Income Captions [Line Items] |  |
Comprehensive income | $ 381 | $ 364
Less: Comprehensive loss attributable to noncontrolling interests |  | (1)
Comprehensive income attributable to Waste Management, Inc. | 381 | 365
Eliminations [Member] |  |
Condensed Statement Of Income Captions [Line Items] |  |
Comprehensive income | (887) | (974)
Comprehensive income attributable to Waste Management, Inc. | (887) | (974)
WM [Member] | Reportable Legal Entities [Member] |  |
Condensed Statement Of Income Captions [Line Items] |  |
Comprehensive income | 349 | 398
Comprehensive income attributable to Waste Management, Inc. | 349 | 398
WM Holdings [Member] | Reportable Legal Entities [Member] |  |
Condensed Statement Of Income Captions [Line Items] |  |
Comprehensive income | 440 | 485
Comprehensive income attributable to Waste Management, Inc. | 440 | 485
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |
Condensed Statement Of Income Captions [Line Items] |  |
Comprehensive income | 479 | 455
Less: Comprehensive loss attributable to noncontrolling interests |  | (1)
Comprehensive income attributable to Waste Management, Inc. | $ 479 | $ 456

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