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Condensed Consolidating Financial Statements - Statements of Comprehensive Income (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Condensed Statement Of Income Captions [Line Items] |  |  |  |
Comprehensive income | $ 478 | $ 394 | $ 842 | $ 705
Less: Comprehensive loss attributable to noncontrolling interests |  | (1) | (1) | (2)
Comprehensive income attributable to Waste Management, Inc. | 478 | 395 | 843 | 707
Eliminations [Member] |  |  |  |
Condensed Statement Of Income Captions [Line Items] |  |  |  |
Comprehensive income | (1,179) | (815) | (2,153) | (1,504)
Comprehensive income attributable to Waste Management, Inc. | (1,179) | (815) | (2,153) | (1,504)
WM [Member] | Reportable Legal Entities [Member] |  |  |  |
Condensed Statement Of Income Captions [Line Items] |  |  |  |
Comprehensive income | 501 | 364 | 899 | 664
Comprehensive income attributable to Waste Management, Inc. | 501 | 364 | 899 | 664
WM Holdings [Member] | Reportable Legal Entities [Member] |  |  |  |
Condensed Statement Of Income Captions [Line Items] |  |  |  |
Comprehensive income | 588 | 406 | 1,073 | 749
Comprehensive income attributable to Waste Management, Inc. | 588 | 406 | 1,073 | 749
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |  |
Condensed Statement Of Income Captions [Line Items] |  |  |  |
Comprehensive income | 568 | 439 | 1,023 | 796
Less: Comprehensive loss attributable to noncontrolling interests |  | (1) | (1) | (2)
Comprehensive income attributable to Waste Management, Inc. | $ 568 | $ 440 | $ 1,024 | $ 798

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