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Condensed Consolidating Financial Statements - Statements of Comprehensive Income (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Condensed Statement Of Income Captions [Line Items] |  |  |  |
Comprehensive income | $ 484 | $ 531 | $ 1,278 | $ 1,373
Less: Comprehensive income (loss) attributable to noncontrolling interests |  | (1) | 1 | (2)
Comprehensive income attributable to Waste Management, Inc. | 484 | 532 | 1,277 | 1,375
Eliminations [Member] |  |  |  |
Condensed Statement Of Income Captions [Line Items] |  |  |  |
Comprehensive income | (1,269) | (1,181) | (3,231) | (3,334)
Comprehensive income attributable to Waste Management, Inc. | (1,269) | (1,181) | (3,231) | (3,334)
WM [Member] | Reportable Legal Entities [Member] |  |  |  |
Condensed Statement Of Income Captions [Line Items] |  |  |  |
Comprehensive income | 497 | 501 | 1,229 | 1,400
Comprehensive income attributable to Waste Management, Inc. | 497 | 501 | 1,229 | 1,400
WM Holdings [Member] | Reportable Legal Entities [Member] |  |  |  |
Condensed Statement Of Income Captions [Line Items] |  |  |  |
Comprehensive income | 667 | 588 | 1,637 | 1,661
Comprehensive income attributable to Waste Management, Inc. | 667 | 588 | 1,637 | 1,661
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |  |
Condensed Statement Of Income Captions [Line Items] |  |  |  |
Comprehensive income | 589 | 623 | 1,643 | 1,646
Less: Comprehensive income (loss) attributable to noncontrolling interests |  | (1) | 1 | (2)
Comprehensive income attributable to Waste Management, Inc. | $ 589 | $ 624 | $ 1,642 | $ 1,648

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