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Condensed Consolidating Financial Statements - Statements of Operations (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
May 31, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Condensed Income Statements, Captions [Line Items] |  |  |  |  |
Operating revenues |  | $ 3,946 | $ 3,739 | $ 7,642 | $ 7,250
Costs and expenses |  | 3,250 | 3,024 | 6,325 | 5,927
Income from operations |  | 696 | 715 | 1,317 | 1,323
Other income (expense): |  |  |  |  |
Interest expense, net |  | (100) | (93) | (196) | (184)
Loss on early extinguishment of debt | $ (84) | (84) |  | (84) |
Other, net |  | (15) | (13) | (78) | (19)
Total other income (expense) |  | (199) | (106) | (358) | (203)
Income before income taxes |  | 497 | 609 | 959 | 1,120
Income tax expense (benefit) |  | 115 | 110 | 230 | 226
Consolidated net income |  | 382 | 499 | 729 | 894
Less: Net income (loss) attributable to noncontrolling interests |  | 1 |  | 1 | (1)
Net income attributable to Waste Management, Inc. |  | 381 | 499 | 728 | 895
Eliminations [Member] |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |
Operating revenues |  | (46) | (44) | (92) | (88)
Costs and expenses |  | (46) | (44) | (92) | (88)
Other income (expense): |  |  |  |  |
Equity in earnings of subsidiaries, net of tax |  | (1,075) | (1,179) | (1,962) | (2,153)
Total other income (expense) |  | (1,075) | (1,179) | (1,962) | (2,153)
Income before income taxes |  | (1,075) | (1,179) | (1,962) | (2,153)
Consolidated net income |  | (1,075) | (1,179) | (1,962) | (2,153)
Net income attributable to Waste Management, Inc. |  | (1,075) | (1,179) | (1,962) | (2,153)
WM [Member] | Reportable Legal Entities [Member] |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |
Costs and expenses |  | 46 | 44 | 92 | 88
Income from operations |  | (46) | (44) | (92) | (88)
Other income (expense): |  |  |  |  |
Interest expense, net |  | (86) | (78) | (166) | (154)
Loss on early extinguishment of debt |  | (70) |  | (70) |
Equity in earnings of subsidiaries, net of tax |  | 530 | 588 | 970 | 1,073
Total other income (expense) |  | 374 | 510 | 734 | 919
Income before income taxes |  | 328 | 466 | 642 | 831
Income tax expense (benefit) |  | (53) | (33) | (86) | (64)
Consolidated net income |  | 381 | 499 | 728 | 895
Net income attributable to Waste Management, Inc. |  | 381 | 499 | 728 | 895
WM Holdings [Member] | Reportable Legal Entities [Member] |  |  |  |  |
Other income (expense): |  |  |  |  |
Interest expense, net |  | (5) | (4) | (10) | (9)
Loss on early extinguishment of debt |  | (14) |  | (14) |
Equity in earnings of subsidiaries, net of tax |  | 545 | 591 | 992 | 1,080
Other, net |  | (1) |  | (4) |
Total other income (expense) |  | 525 | 587 | 964 | 1,071
Income before income taxes |  | 525 | 587 | 964 | 1,071
Income tax expense (benefit) |  | (5) | (1) | (6) | (2)
Consolidated net income |  | 530 | 588 | 970 | 1,073
Net income attributable to Waste Management, Inc. |  | 530 | 588 | 970 | 1,073
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |
Operating revenues |  | 3,992 | 3,783 | 7,734 | 7,338
Costs and expenses |  | 3,250 | 3,024 | 6,325 | 5,927
Income from operations |  | 742 | 759 | 1,409 | 1,411
Other income (expense): |  |  |  |  |
Interest expense, net |  | (9) | (11) | (20) | (21)
Other, net |  | (14) | (13) | (74) | (19)
Total other income (expense) |  | (23) | (24) | (94) | (40)
Income before income taxes |  | 719 | 735 | 1,315 | 1,371
Income tax expense (benefit) |  | 173 | 144 | 322 | 292
Consolidated net income |  | 546 | 591 | 993 | 1,079
Less: Net income (loss) attributable to noncontrolling interests |  | 1 |  | 1 | (1)
Net income attributable to Waste Management, Inc. |  | $ 545 | $ 591 | $ 992 | $ 1,080

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