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Condensed Consolidating Financial Statements - Statements of Operations (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 3,652 | $ 3,716 | $ 3,677 | $ 3,440 | $ 3,460 | $ 3,548 | $ 3,425 | $ 3,176 | $ 14,485 | $ 13,609 | $ 12,961
Costs and expenses |  |  |  |  |  |  |  |  | 11,849 | 11,313 | 10,916
Income from operations | 704 | 701 | 673 | 558 | 617 | 560 | 611 | 508 | 2,636 | 2,296 | 2,045
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  | (363) | (376) | (385)
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  | (6) | (4) | (555)
Other, net |  |  |  |  |  |  |  |  | (76) | (94) | (45)
Total other income (expense) |  |  |  |  |  |  |  |  | (445) | (474) | (985)
Income before income taxes |  |  |  |  |  |  |  |  | 2,191 | 1,822 | 1,060
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 242 | 642 | 308
Consolidated net income | 903 | 388 | 361 | 297 | 334 | 304 | 286 | 256 | 1,949 | 1,180 | 752
Less: Net income (loss) attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | (2) | (1)
Net income attributable to Waste Management, Inc. | $ 903 | $ 386 | $ 362 | $ 298 | $ 335 | $ 302 | $ 287 | $ 258 | 1,949 | 1,182 | 753
Insurance premium payment |  |  |  |  |  |  |  |  | 555 |  |
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 |  |  |  |  |  |  |  |  | (4,951) | (2,748) | (2,534)
Total other income (expense) |  |  |  |  |  |  |  |  | (4,951) | (2,748) | (2,534)
Income before income taxes |  |  |  |  |  |  |  |  | (4,951) | (2,748) | (2,534)
Consolidated net income |  |  |  |  |  |  |  |  | (4,951) | (2,748) | (2,534)
Net income attributable to Waste Management, Inc. |  |  |  |  |  |  |  |  | (4,951) | (2,748) | (2,534)
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 |  |  |  |  |  |  |  |  | (299) | (303) | (298)
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  | (6) | (1) | (500)
Equity in earnings of subsidiaries, net of tax |  |  |  |  |  |  |  |  | 2,469 | 1,367 | 1,245
Other, net |  |  |  |  |  |  |  |  | 2 |  |
Total other income (expense) |  |  |  |  |  |  |  |  | 2,166 | 1,063 | 447
Income before income taxes |  |  |  |  |  |  |  |  | 1,611 | 1,063 | 447
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (338) | (119) | (306)
Consolidated net income |  |  |  |  |  |  |  |  | 1,949 | 1,182 | 753
Net income attributable to Waste Management, Inc. |  |  |  |  |  |  |  |  | 1,949 | 1,182 | 753
WM Holdings [Member] | Reportable Legal Entities [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Costs and expenses |  |  |  |  |  |  |  |  |  |  | (1)
Income from operations |  |  |  |  |  |  |  |  |  |  | 1
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  | (20) | (20) | (22)
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  |  | (52)
Equity in earnings of subsidiaries, net of tax |  |  |  |  |  |  |  |  | 2,482 | 1,381 | 1,289
Other, net |  |  |  |  |  |  |  |  | (1) |  |
Total other income (expense) |  |  |  |  |  |  |  |  | 2,461 | 1,361 | 1,215
Income before income taxes |  |  |  |  |  |  |  |  | 2,461 | 1,361 | 1,216
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (8) | (8) | (29)
Consolidated net income |  |  |  |  |  |  |  |  | 2,469 | 1,369 | 1,245
Net income attributable to Waste Management, Inc. |  |  |  |  |  |  |  |  | 2,469 | 1,369 | 1,245
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 15,040 | 13,609 | 12,961
Costs and expenses |  |  |  |  |  |  |  |  | 11,849 | 11,313 | 10,917
Income from operations |  |  |  |  |  |  |  |  | 3,191 | 2,296 | 2,044
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  | (44) | (53) | (65)
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  | (3) | (3)
Other, net |  |  |  |  |  |  |  |  | (77) | (94) | (45)
Total other income (expense) |  |  |  |  |  |  |  |  | (121) | (150) | (113)
Income before income taxes |  |  |  |  |  |  |  |  | 3,070 | 2,146 | 1,931
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 588 | 769 | 643
Consolidated net income |  |  |  |  |  |  |  |  | 2,482 | 1,377 | 1,288
Less: Net income (loss) attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | (2) | (1)
Net income attributable to Waste Management, Inc. |  |  |  |  |  |  |  |  | $ 2,482 | $ 1,379 | $ 1,289

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