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Condensed Consolidating Financial Statements - Statements of Operations (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Condensed Income Statements, Captions [Line Items] |  |  |  |
Operating revenues | $ 3,739 | $ 3,677 | $ 7,250 | $ 7,117
Costs and expenses | 3,024 | 3,004 | 5,927 | 5,886
Income from operations | 715 | 673 | 1,323 | 1,231
Other income (expense): |  |  |  |
Interest expense, net | (93) | (90) | (184) | (182)
Other, net | (13) | (13) | (19) | (45)
Total other income (expense) | (106) | (103) | (203) | (227)
Income before income taxes | 609 | 570 | 1,120 | 1,004
Income tax expense (benefit) | 110 | 209 | 226 | 346
Consolidated net income | 499 | 361 | 894 | 658
Less: Net loss attributable to noncontrolling interests |  | (1) | (1) | (2)
Net income attributable to Waste Management, Inc. | 499 | 362 | 895 | 660
Eliminations [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Operating revenues | (44) |  | (88) |
Costs and expenses | (44) |  | (88) |
Other income (expense): |  |  |  |
Equity in earnings of subsidiaries, net of tax | (1,179) | (815) | (2,153) | (1,504)
Total other income (expense) | (1,179) | (815) | (2,153) | (1,504)
Income before income taxes | (1,179) | (815) | (2,153) | (1,504)
Consolidated net income | (1,179) | (815) | (2,153) | (1,504)
Net income attributable to Waste Management, Inc. | (1,179) | (815) | (2,153) | (1,504)
WM [Member] | Reportable Legal Entities [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Costs and expenses | 44 |  | 88 |
Income from operations | (44) |  | (88) |
Other income (expense): |  |  |  |
Interest expense, net | (78) | (74) | (154) | (148)
Equity in earnings of subsidiaries, net of tax | 588 | 406 | 1,073 | 749
Total other income (expense) | 510 | 332 | 919 | 601
Income before income taxes | 466 | 332 | 831 | 601
Income tax expense (benefit) | (33) | (30) | (64) | (59)
Consolidated net income | 499 | 362 | 895 | 660
Net income attributable to Waste Management, Inc. | 499 | 362 | 895 | 660
WM Holdings [Member] | Reportable Legal Entities [Member] |  |  |  |
Other income (expense): |  |  |  |
Interest expense, net | (4) | (5) | (9) | (10)
Equity in earnings of subsidiaries, net of tax | 591 | 409 | 1,080 | 755
Total other income (expense) | 587 | 404 | 1,071 | 745
Income before income taxes | 587 | 404 | 1,071 | 745
Income tax expense (benefit) | (1) | (2) | (2) | (4)
Consolidated net income | 588 | 406 | 1,073 | 749
Net income attributable to Waste Management, Inc. | 588 | 406 | 1,073 | 749
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Operating revenues | 3,783 | 3,677 | 7,338 | 7,117
Costs and expenses | 3,024 | 3,004 | 5,927 | 5,886
Income from operations | 759 | 673 | 1,411 | 1,231
Other income (expense): |  |  |  |
Interest expense, net | (11) | (11) | (21) | (24)
Other, net | (13) | (13) | (19) | (45)
Total other income (expense) | (24) | (24) | (40) | (69)
Income before income taxes | 735 | 649 | 1,371 | 1,162
Income tax expense (benefit) | 144 | 241 | 292 | 409
Consolidated net income | 591 | 408 | 1,079 | 753
Less: Net loss attributable to noncontrolling interests |  | (1) | (1) | (2)
Net income attributable to Waste Management, Inc. | $ 591 | $ 409 | $ 1,080 | $ 755

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