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Condensed Consolidating Financial Statements - Statements of Comprehensive Income (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Statement Of Income Captions [Line Items] |  |  |
Comprehensive income | $ 1,750 | $ 1,833 | $ 2,037
Less: Comprehensive income (loss) attributable to noncontrolling interests | 1 | (2) |
Comprehensive income attributable to Waste Management, Inc. | 1,749 | 1,835 | 2,037
Eliminations [Member] |  |  |
Condensed Statement Of Income Captions [Line Items] |  |  |
Comprehensive income | (4,055) | (4,324) | (4,951)
Comprehensive income attributable to Waste Management, Inc. | (4,055) | (4,324) | (4,951)
WM [Member] | Reportable Legal Entities [Member] |  |  |
Condensed Statement Of Income Captions [Line Items] |  |  |
Comprehensive income | 1,678 | 1,933 | 1,955
Comprehensive income attributable to Waste Management, Inc. | 1,678 | 1,933 | 1,955
WM Holdings [Member] | Reportable Legal Entities [Member] |  |  |
Condensed Statement Of Income Captions [Line Items] |  |  |
Comprehensive income | 2,047 | 2,154 | 2,469
Comprehensive income attributable to Waste Management, Inc. | 2,047 | 2,154 | 2,469
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |
Condensed Statement Of Income Captions [Line Items] |  |  |
Comprehensive income | 2,080 | 2,070 | 2,564
Less: Comprehensive income (loss) attributable to noncontrolling interests | 1 | (2) |
Comprehensive income attributable to Waste Management, Inc. | $ 2,079 | $ 2,072 | $ 2,564

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