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Condensed Consolidating Financial Statements - Condensed Consolidating Statements of Operations (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Condensed Income Statements, Captions [Line Items] |  |  |  |
Operating revenues | $ 3,716 | $ 3,548 | $ 10,833 | $ 10,149
Costs and expenses | 3,015 | 2,988 | 8,901 | 8,470
Income from operations | 701 | 560 | 1,932 | 1,679
Other income (expense): |  |  |  |
Interest expense, net | (90) | (94) | (272) | (282)
Other, net | (8) | (9) | (53) | (85)
Total other income (expense) | (98) | (103) | (325) | (367)
Income before income taxes | 603 | 457 | 1,607 | 1,312
Income tax expense (benefit) | 215 | 153 | 561 | 466
Consolidated net income | 388 | 304 | 1,046 | 846
Less: Net income (loss) attributable to noncontrolling interests | 2 | 2 |  | (1)
Net income attributable to Waste Management, Inc. | 386 | 302 | 1,046 | 847
Eliminations [Member] |  |  |  |
Other income (expense): |  |  |  |
Equity in earnings of subsidiaries, net of tax | (867) | (701) | (2,371) | (1,981)
Total other income (expense) | (867) | (701) | (2,371) | (1,981)
Income before income taxes | (867) | (701) | (2,371) | (1,981)
Consolidated net income | (867) | (701) | (2,371) | (1,981)
Net income attributable to Waste Management, Inc. | (867) | (701) | (2,371) | (1,981)
WM [Member] | Reportable Legal Entities [Member] |  |  |  |
Other income (expense): |  |  |  |
Interest expense, net | (75) | (77) | (223) | (227)
Equity in earnings of subsidiaries, net of tax | 432 | 349 | 1,181 | 986
Other, net |  |  |  | (1)
Total other income (expense) | 357 | 272 | 958 | 758
Income before income taxes | 357 | 272 | 958 | 758
Income tax expense (benefit) | (29) | (30) | (88) | (89)
Consolidated net income | 386 | 302 | 1,046 | 847
Net income attributable to Waste Management, Inc. | 386 | 302 | 1,046 | 847
WM Holdings [Member] | Reportable Legal Entities [Member] |  |  |  |
Other income (expense): |  |  |  |
Interest expense, net | (5) | (5) | (15) | (15)
Equity in earnings of subsidiaries, net of tax | 435 | 352 | 1,190 | 995
Total other income (expense) | 430 | 347 | 1,175 | 980
Income before income taxes | 430 | 347 | 1,175 | 980
Income tax expense (benefit) | (2) | (2) | (6) | (6)
Consolidated net income | 432 | 349 | 1,181 | 986
Net income attributable to Waste Management, Inc. | 432 | 349 | 1,181 | 986
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Operating revenues | 3,716 | 3,548 | 10,833 | 10,149
Costs and expenses | 3,015 | 2,988 | 8,901 | 8,470
Income from operations | 701 | 560 | 1,932 | 1,679
Other income (expense): |  |  |  |
Interest expense, net | (10) | (12) | (34) | (40)
Other, net | (8) | (9) | (53) | (84)
Total other income (expense) | (18) | (21) | (87) | (124)
Income before income taxes | 683 | 539 | 1,845 | 1,555
Income tax expense (benefit) | 246 | 185 | 655 | 561
Consolidated net income | 437 | 354 | 1,190 | 994
Less: Net income (loss) attributable to noncontrolling interests | 2 | 2 |  | (1)
Net income attributable to Waste Management, Inc. | $ 435 | $ 352 | $ 1,190 | $ 995

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