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Condensed Consolidating Financial Statements - Statements of Operations (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Condensed Income Statements, Captions [Line Items] |  |
Operating revenues | $ 3,511 | $ 3,440
Costs and expenses | 2,903 | 2,882
Income from operations | 608 | 558
Other income (expense): |  |
Interest expense, net | (91) | (92)
Other, net | (6) | (32)
Total other income (expense) | (97) | (124)
Income before income taxes | 511 | 434
Income tax expense (benefit) | 116 | 137
Consolidated net income | 395 | 297
Less: Net loss attributable to noncontrolling interests | (1) | (1)
Net income attributable to Waste Management, Inc. | 396 | 298
Eliminations [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Operating revenues | (44) |
Costs and expenses | (44) |
Other income (expense): |  |
Equity in earnings of subsidiaries, net of tax | (974) | (689)
Total other income (expense) | (974) | (689)
Income before income taxes | (974) | (689)
Consolidated net income | (974) | (689)
Net income attributable to Waste Management, Inc. | (974) | (689)
WM [Member] | Reportable Legal Entities [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Costs and expenses | 44 |
Income from operations | (44) |
Other income (expense): |  |
Interest expense, net | (76) | (74)
Equity in earnings of subsidiaries, net of tax | 485 | 343
Total other income (expense) | 409 | 269
Income before income taxes | 365 | 269
Income tax expense (benefit) | (31) | (29)
Consolidated net income | 396 | 298
Net income attributable to Waste Management, Inc. | 396 | 298
WM Holdings [Member] | Reportable Legal Entities [Member] |  |
Other income (expense): |  |
Interest expense, net | (5) | (5)
Equity in earnings of subsidiaries, net of tax | 489 | 346
Total other income (expense) | 484 | 341
Income before income taxes | 484 | 341
Income tax expense (benefit) | (1) | (2)
Consolidated net income | 485 | 343
Net income attributable to Waste Management, Inc. | 485 | 343
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Operating revenues | 3,555 | 3,440
Costs and expenses | 2,903 | 2,882
Income from operations | 652 | 558
Other income (expense): |  |
Interest expense, net | (10) | (13)
Other, net | (6) | (32)
Total other income (expense) | (16) | (45)
Income before income taxes | 636 | 513
Income tax expense (benefit) | 148 | 168
Consolidated net income | 488 | 345
Less: Net loss attributable to noncontrolling interests | (1) | (1)
Net income attributable to Waste Management, Inc. | $ 489 | $ 346

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