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Quarterly Financial Data (Unaudited) - Summary (Detail) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Data
Operating revenues	$ 3,846	$ 3,967	$ 3,946	$ 3,696	$ 3,842	$ 3,822	$ 3,739	$ 3,511	$ 15,455	$ 14,914	$ 14,485
Income from operations	655	734	696	621	767	699	715	608	2,706	2,789	2,636
Consolidated net income	447	495	382	347	531	498	499	395	1,671	1,923	1,949
Net income attributable to Waste Management, Inc.	$ 447	$ 495	$ 381	$ 347	$ 531	$ 499	$ 499	$ 396	$ 1,670	$ 1,925	$ 1,949
Basic earnings per common share	$ 1.05	$ 1.17	$ 0.90	$ 0.82	$ 1.25	$ 1.16	$ 1.16	$ 0.91	$ 3.93	$ 4.49	$ 4.44
Diluted earnings per common share	$ 1.05	$ 1.16	$ 0.89	$ 0.81	$ 1.24	$ 1.16	$ 1.15	$ 0.91	$ 3.91	$ 4.45	$ 4.41

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