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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

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