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Condensed Consolidating Financial Statements - Statements of Operations (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Condensed Income Statements, Captions [Line Items] |  |
Operating revenues | $ 3,729 | $ 3,696
Costs and expenses | 3,156 | 3,075
Income from operations | 573 | 621
Other income (expense): |  |
Interest expense, net | (112) | (96)
Other, net | (26) | (63)
Total other income (expense) | (138) | (159)
Income before income taxes | 435 | 462
Income tax expense (benefit) | 74 | 115
Consolidated net income | 361 | 347
Net income attributable to Waste Management, Inc. | 361 | 347
Eliminations [Member] |  |
Other income (expense): |  |
Equity in earnings of subsidiaries, net of tax | (861) | (819)
Total other income (expense) | (861) | (819)
Income before income taxes | (861) | (819)
Consolidated net income | (861) | (819)
Net income attributable to Waste Management, Inc. | (861) | (819)
WM [Member] | Reportable Legal Entities [Member] |  |
Other income (expense): |  |
Interest expense, net | (93) | (80)
Equity in earnings of subsidiaries, net of tax | 429 | 406
Total other income (expense) | 336 | 326
Income before income taxes | 336 | 326
Income tax expense (benefit) | (25) | (21)
Consolidated net income | 361 | 347
Net income attributable to Waste Management, Inc. | 361 | 347
WM Holdings [Member] | Reportable Legal Entities [Member] |  |
Other income (expense): |  |
Interest expense, net | (4) | (5)
Equity in earnings of subsidiaries, net of tax | 432 | 413
Other, net |  | (3)
Total other income (expense) | 428 | 405
Income before income taxes | 428 | 405
Income tax expense (benefit) | (1) | (1)
Consolidated net income | 429 | 406
Net income attributable to Waste Management, Inc. | 429 | 406
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Operating revenues | 3,729 | 3,696
Costs and expenses | 3,156 | 3,075
Income from operations | 573 | 621
Other income (expense): |  |
Interest expense, net | (15) | (11)
Other, net | (26) | (60)
Total other income (expense) | (41) | (71)
Income before income taxes | 532 | 550
Income tax expense (benefit) | 100 | 137
Consolidated net income | 432 | 413
Net income attributable to Waste Management, Inc. | $ 432 | $ 413

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