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Condensed Consolidating Financial Statements - Statements of Comprehensive Income (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Condensed Statement Of Income Captions [Line Items] |  |
Comprehensive income | $ 278 | $ 381
Comprehensive income attributable to Waste Management, Inc. | 278 | 381
Eliminations [Member] |  |
Condensed Statement Of Income Captions [Line Items] |  |
Comprehensive income | (861) | (819)
Comprehensive income attributable to Waste Management, Inc. | (861) | (819)
WM [Member] | Reportable Legal Entities [Member] |  |
Condensed Statement Of Income Captions [Line Items] |  |
Comprehensive income | 363 | 349
Comprehensive income attributable to Waste Management, Inc. | 363 | 349
WM Holdings [Member] | Reportable Legal Entities [Member] |  |
Condensed Statement Of Income Captions [Line Items] |  |
Comprehensive income | 429 | 406
Comprehensive income attributable to Waste Management, Inc. | 429 | 406
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |
Condensed Statement Of Income Captions [Line Items] |  |
Comprehensive income | 347 | 445
Comprehensive income attributable to Waste Management, Inc. | $ 347 | $ 445

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