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Condensed Consolidating Financial Statements - Statements of Operations (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Condensed Income Statements, Captions [Line Items] |  |
Operating revenues | $ 3,696 | $ 3,511
Costs and expenses | 3,075 | 2,903
Income from operations | 621 | 608
Other income (expense): |  |
Interest expense, net | (96) | (91)
Other, net | (63) | (6)
Total other income (expense) | (159) | (97)
Income before income taxes | 462 | 511
Income tax expense (benefit) | 115 | 116
Consolidated net income | 347 | 395
Less: Net loss attributable to noncontrolling interests |  | (1)
Net income attributable to Waste Management, Inc. | 347 | 396
Eliminations [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Operating revenues | (46) | (44)
Costs and expenses | (46) | (44)
Other income (expense): |  |
Equity in earnings of subsidiaries, net of tax | (887) | (974)
Total other income (expense) | (887) | (974)
Income before income taxes | (887) | (974)
Consolidated net income | (887) | (974)
Net income attributable to Waste Management, Inc. | (887) | (974)
WM [Member] | Reportable Legal Entities [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Costs and expenses | 46 | 44
Income from operations | (46) | (44)
Other income (expense): |  |
Interest expense, net | (80) | (76)
Equity in earnings of subsidiaries, net of tax | 440 | 485
Total other income (expense) | 360 | 409
Income before income taxes | 314 | 365
Income tax expense (benefit) | (33) | (31)
Consolidated net income | 347 | 396
Net income attributable to Waste Management, Inc. | 347 | 396
WM Holdings [Member] | Reportable Legal Entities [Member] |  |
Other income (expense): |  |
Interest expense, net | (5) | (5)
Equity in earnings of subsidiaries, net of tax | 447 | 489
Other, net | (3) |
Total other income (expense) | 439 | 484
Income before income taxes | 439 | 484
Income tax expense (benefit) | (1) | (1)
Consolidated net income | 440 | 485
Net income attributable to Waste Management, Inc. | 440 | 485
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Operating revenues | 3,742 | 3,555
Costs and expenses | 3,075 | 2,903
Income from operations | 667 | 652
Other income (expense): |  |
Interest expense, net | (11) | (10)
Other, net | (60) | (6)
Total other income (expense) | (71) | (16)
Income before income taxes | 596 | 636
Income tax expense (benefit) | 149 | 148
Consolidated net income | 447 | 488
Less: Net loss attributable to noncontrolling interests |  | (1)
Net income attributable to Waste Management, Inc. | $ 447 | $ 489

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