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Condensed Consolidating Financial Statements - Statements of Operations (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 3,846 | $ 3,967 | $ 3,946 | $ 3,696 | $ 3,842 | $ 3,822 | $ 3,739 | $ 3,511 | $ 15,455 | $ 14,914 | $ 14,485
Costs and expenses |  |  |  |  |  |  |  |  | 12,749 | 12,125 | 11,849
Income from operations | 655 | 734 | 696 | 621 | 767 | 699 | 715 | 608 | 2,706 | 2,789 | 2,636
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  | (411) | (374) | (363)
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  | (85) |  | (6)
Other, net |  |  |  |  |  |  |  |  | (105) | (39) | (76)
Total other income (expense) |  |  |  |  |  |  |  |  | (601) | (413) | (445)
Income before income taxes |  |  |  |  |  |  |  |  | 2,105 | 2,376 | 2,191
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 434 | 453 | 242
Consolidated net income | 447 | 495 | 382 | 347 | 531 | 498 | 499 | 395 | 1,671 | 1,923 | 1,949
Less: Net income (loss) attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 1 | (2) |
Net income attributable to Waste Management, Inc. | $ 447 | $ 495 | $ 381 | $ 347 | $ 531 | $ 499 | $ 499 | $ 396 | 1,670 | 1,925 | 1,949
Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  | (555)
Costs and expenses |  |  |  |  |  |  |  |  |  |  | (555)
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of subsidiaries, net of tax |  |  |  |  |  |  |  |  | (3,983) | (4,324) | (4,951)
Other, net |  |  |  |  |  |  |  |  | (72) |  |
Total other income (expense) |  |  |  |  |  |  |  |  | (4,055) | (4,324) | (4,951)
Income before income taxes |  |  |  |  |  |  |  |  | (4,055) | (4,324) | (4,951)
Consolidated net income |  |  |  |  |  |  |  |  | (4,055) | (4,324) | (4,951)
Net income attributable to Waste Management, Inc. |  |  |  |  |  |  |  |  | (4,055) | (4,324) | (4,951)
WM [Member] | Reportable Legal Entities [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Costs and expenses |  |  |  |  |  |  |  |  |  |  | 555
Income from operations |  |  |  |  |  |  |  |  |  |  | (555)
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  | (347) | (312) | (299)
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  | (70) |  | (6)
Equity in earnings of subsidiaries, net of tax |  |  |  |  |  |  |  |  | 1,976 | 2,155 | 2,469
Other, net |  |  |  |  |  |  |  |  |  |  | 2
Total other income (expense) |  |  |  |  |  |  |  |  | 1,559 | 1,843 | 2,166
Income before income taxes |  |  |  |  |  |  |  |  | 1,559 | 1,843 | 1,611
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (111) | (82) | (338)
Consolidated net income |  |  |  |  |  |  |  |  | 1,670 | 1,925 | 1,949
Net income attributable to Waste Management, Inc. |  |  |  |  |  |  |  |  | 1,670 | 1,925 | 1,949
WM Holdings [Member] | Reportable Legal Entities [Member] |  |  |  |  |  |  |  |  |  |  |
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  | (19) | (20) | (20)
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  | (14) |  |
Equity in earnings of subsidiaries, net of tax |  |  |  |  |  |  |  |  | 2,007 | 2,169 | 2,482
Other, net |  |  |  |  |  |  |  |  | 68 |  | (1)
Total other income (expense) |  |  |  |  |  |  |  |  | 2,042 | 2,149 | 2,461
Income before income taxes |  |  |  |  |  |  |  |  | 2,042 | 2,149 | 2,461
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (5) | (5) | (8)
Consolidated net income |  |  |  |  |  |  |  |  | 2,047 | 2,154 | 2,469
Net income attributable to Waste Management, Inc. |  |  |  |  |  |  |  |  | 2,047 | 2,154 | 2,469
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 15,455 | 14,914 | 15,040
Costs and expenses |  |  |  |  |  |  |  |  | 12,749 | 12,125 | 11,849
Income from operations |  |  |  |  |  |  |  |  | 2,706 | 2,789 | 3,191
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  | (45) | (42) | (44)
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  | (1) |  |
Other, net |  |  |  |  |  |  |  |  | (101) | (39) | (77)
Total other income (expense) |  |  |  |  |  |  |  |  | (147) | (81) | (121)
Income before income taxes |  |  |  |  |  |  |  |  | 2,559 | 2,708 | 3,070
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 550 | 540 | 588
Consolidated net income |  |  |  |  |  |  |  |  | 2,009 | 2,168 | 2,482
Less: Net income (loss) attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 1 | (2) |
Net income attributable to Waste Management, Inc. |  |  |  |  |  |  |  |  | $ 2,008 | $ 2,170 | $ 2,482

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