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Condensed Consolidating Financial Statements - Statements of Operations (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Condensed Income Statements, Captions [Line Items]                      
Operating revenues $ 3,842 $ 3,822 $ 3,739 $ 3,511 $ 3,652 $ 3,716 $ 3,677 $ 3,440 $ 14,914 $ 14,485 $ 13,609
Costs and expenses                 12,125 11,849 11,313
Income from operations 767 699 715 608 704 701 673 558 2,789 2,636 2,296
Other income (expense):                      
Interest expense, net                 (374) (363) (376)
Other, net                 (39) (82) (98)
Total other income (expense)                 (413) (445) (474)
Income before income taxes                 2,376 2,191 1,822
Income tax expense (benefit)                 453 242 642
Consolidated net income 531 498 499 395 903 388 361 297 1,923 1,949 1,180
Less: Net loss attributable to noncontrolling interests                 (2)   (2)
Net income attributable to Waste Management, Inc. $ 531 $ 499 $ 499 $ 396 $ 903 $ 386 $ 362 $ 298 1,925 1,949 1,182
Eliminations [Member]                      
Condensed Income Statements, Captions [Line Items]                      
Operating revenues                 (176) (555)  
Costs and expenses                 (176) (555)  
Other income (expense):                      
Equity in earnings of subsidiaries, net of tax                 (4,582) (4,951) (2,748)
Total other income (expense)                 (4,582) (4,951) (2,748)
Income before income taxes                 (4,582) (4,951) (2,748)
Consolidated net income                 (4,582) (4,951) (2,748)
Net income attributable to Waste Management, Inc.                 (4,582) (4,951) (2,748)
WM [Member] | Reportable Legal Entities [Member]                      
Condensed Income Statements, Captions [Line Items]                      
Costs and expenses                 176 555  
Income from operations                 (176) (555)  
Other income (expense):                      
Interest expense, net                 (312) (299) (303)
Equity in earnings of subsidiaries, net of tax                 2,284 2,469 1,367
Other, net                   (4) (1)
Total other income (expense)                 1,972 2,166 1,063
Income before income taxes                 1,796 1,611 1,063
Income tax expense (benefit)                 (129) (338) (119)
Consolidated net income                 1,925 1,949 1,182
Net income attributable to Waste Management, Inc.                 1,925 1,949 1,182
WM Holdings [Member] | Reportable Legal Entities [Member]                      
Other income (expense):                      
Interest expense, net                 (20) (20) (20)
Equity in earnings of subsidiaries, net of tax                 2,298 2,482 1,381
Other, net                   (1)  
Total other income (expense)                 2,278 2,461 1,361
Income before income taxes                 2,278 2,461 1,361
Income tax expense (benefit)                 (5) (8) (8)
Consolidated net income                 2,283 2,469 1,369
Net income attributable to Waste Management, Inc.                 2,283 2,469 1,369
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]                      
Condensed Income Statements, Captions [Line Items]                      
Operating revenues                 15,090 15,040 13,609
Costs and expenses                 12,125 11,849 11,313
Income from operations                 2,965 3,191 2,296
Other income (expense):                      
Interest expense, net                 (42) (44) (53)
Other, net                 (39) (77) (97)
Total other income (expense)                 (81) (121) (150)
Income before income taxes                 2,884 3,070 2,146
Income tax expense (benefit)                 587 588 769
Consolidated net income                 2,297 2,482 1,377
Less: Net loss attributable to noncontrolling interests                 (2)   (2)
Net income attributable to Waste Management, Inc.                 $ 2,299 $ 2,482 $ 1,379