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Condensed Consolidating Financial Statements - Statements of Operations (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
May 31, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Condensed Income Statements, Captions [Line Items] |  |  |  |  |
Operating revenues |  | $ 3,967 | $ 3,822 | $ 11,609 | $ 11,072
Costs and expenses |  | 3,233 | 3,123 | 9,558 | 9,050
Income from operations |  | 734 | 699 | 2,051 | 2,022
Other income (expense): |  |  |  |  |
Interest expense, net |  | (105) | (93) | (301) | (277)
Loss on early extinguishment of debt | $ (84) | (1) |  | (85) |
Other, net |  | (13) | (9) | (91) | (28)
Total other income (expense) |  | (119) | (102) | (477) | (305)
Income before income taxes |  | 615 | 597 | 1,574 | 1,717
Income tax expense (benefit) |  | 120 | 99 | 350 | 325
Consolidated net income |  | 495 | 498 | 1,224 | 1,392
Less: Net income (loss) attributable to noncontrolling interests |  |  | (1) | 1 | (2)
Net income attributable to Waste Management, Inc. |  | 495 | 499 | 1,223 | 1,394
Eliminations [Member] |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |
Operating revenues |  | (45) | (44) | (137) | (132)
Costs and expenses |  | (45) | (44) | (137) | (132)
Other income (expense): |  |  |  |  |
Equity in earnings of subsidiaries, net of tax |  | (1,197) | (1,181) | (3,159) | (3,334)
Other, net |  | (72) |  | (72) |
Total other income (expense) |  | (1,269) | (1,181) | (3,231) | (3,334)
Income before income taxes |  | (1,269) | (1,181) | (3,231) | (3,334)
Consolidated net income |  | (1,269) | (1,181) | (3,231) | (3,334)
Net income attributable to Waste Management, Inc. |  | (1,269) | (1,181) | (3,231) | (3,334)
WM [Member] | Reportable Legal Entities [Member] |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |
Costs and expenses |  | 45 | 44 | 137 | 132
Income from operations |  | (45) | (44) | (137) | (132)
Other income (expense): |  |  |  |  |
Interest expense, net |  | (92) | (78) | (258) | (232)
Loss on early extinguishment of debt |  |  |  | (70) |
Equity in earnings of subsidiaries, net of tax |  | 595 | 589 | 1,565 | 1,662
Total other income (expense) |  | 503 | 511 | 1,237 | 1,430
Income before income taxes |  | 458 | 467 | 1,100 | 1,298
Income tax expense (benefit) |  | (37) | (32) | (123) | (96)
Consolidated net income |  | 495 | 499 | 1,223 | 1,394
Net income attributable to Waste Management, Inc. |  | 495 | 499 | 1,223 | 1,394
WM Holdings [Member] | Reportable Legal Entities [Member] |  |  |  |  |
Other income (expense): |  |  |  |  |
Interest expense, net |  | (5) | (6) | (15) | (15)
Loss on early extinguishment of debt |  |  |  | (14) |
Equity in earnings of subsidiaries, net of tax |  | 602 | 592 | 1,594 | 1,672
Other, net |  | 72 |  | 68 |
Total other income (expense) |  | 669 | 586 | 1,633 | 1,657
Income before income taxes |  | 669 | 586 | 1,633 | 1,657
Income tax expense (benefit) |  | 2 | (2) | (4) | (4)
Consolidated net income |  | 667 | 588 | 1,637 | 1,661
Net income attributable to Waste Management, Inc. |  | 667 | 588 | 1,637 | 1,661
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |
Operating revenues |  | 4,012 | 3,866 | 11,746 | 11,204
Costs and expenses |  | 3,233 | 3,123 | 9,558 | 9,050
Income from operations |  | 779 | 743 | 2,188 | 2,154
Other income (expense): |  |  |  |  |
Interest expense, net |  | (8) | (9) | (28) | (30)
Loss on early extinguishment of debt |  | (1) |  | (1) |
Other, net |  | (13) | (9) | (87) | (28)
Total other income (expense) |  | (22) | (18) | (116) | (58)
Income before income taxes |  | 757 | 725 | 2,072 | 2,096
Income tax expense (benefit) |  | 155 | 133 | 477 | 425
Consolidated net income |  | 602 | 592 | 1,595 | 1,671
Less: Net income (loss) attributable to noncontrolling interests |  |  | (1) | 1 | (2)
Net income attributable to Waste Management, Inc. |  | $ 602 | $ 593 | $ 1,594 | $ 1,673

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