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Quarterly Financial Data (Unaudited) - Summary (Detail) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Data
Operating revenues	$ 3,842	$ 3,822	$ 3,739	$ 3,511	$ 3,652	$ 3,716	$ 3,677	$ 3,440	$ 14,914	$ 14,485	$ 13,609
Income from operations	767	699	715	608	704	701	673	558	2,789	2,636	2,296
Consolidated net income	531	498	499	395	903	388	361	297	1,923	1,949	1,180
Net income attributable to Waste Management, Inc.	$ 531	$ 499	$ 499	$ 396	$ 903	$ 386	$ 362	$ 298	$ 1,925	$ 1,949	$ 1,182
Basic earnings per common share	$ 1.25	$ 1.16	$ 1.16	$ 0.91	$ 2.08	$ 0.88	$ 0.82	$ 0.68	$ 4.49	$ 4.44	$ 2.66
Diluted earnings per common share	$ 1.24	$ 1.16	$ 1.15	$ 0.91	$ 2.06	$ 0.87	$ 0.81	$ 0.67	$ 4.45	$ 4.41	$ 2.65

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