Segment and Related Information - Summary (Detail) $ in Millions	3 Months Ended
Mar. 31, 2024 USD ($) segment	Mar. 31, 2023 USD ($)
Segment Reporting
Number of reportable segments \| segment	4
Operating revenues	$ (5,159)	$ (4,892)
Net Operating Revenues	1,016	825
Collection and Disposal [Member]
Segment Reporting
Operating revenues	(4,716)	(4,523)
Net Operating Revenues	1,279	1,064
Collection and Disposal [Member] \| East Tier {Member]
Segment Reporting
Operating revenues	(2,081)	(2,045)
Net Operating Revenues	654	531
Collection and Disposal [Member] \| West Tier [Member]
Segment Reporting
Operating revenues	(1,993)	(1,897)
Net Operating Revenues	627	531
Collection and Disposal [Member] \| Other Ancillary [Member]
Segment Reporting
Operating revenues	(642)	(581)
Net Operating Revenues	(2)	2
Recycling Processing and Sales [Member]
Segment Reporting
Operating revenues	(368)	(294)
Net Operating Revenues	19	13
WM Renewable Energy [Member]
Segment Reporting
Operating revenues	(69)	(69)
Net Operating Revenues	21	20
Corporate and Other [Member]
Segment Reporting
Operating revenues	(6)	(6)
Net Operating Revenues	(303)	(272)
Operating Segments [Member]
Segment Reporting
Operating revenues	(6,317)	(6,034)
Operating Segments [Member] \| Collection and Disposal [Member]
Segment Reporting
Operating revenues	(5,799)	(5,578)
Operating Segments [Member] \| Collection and Disposal [Member] \| East Tier {Member]
Segment Reporting
Operating revenues	(2,616)	(2,561)
Operating Segments [Member] \| Collection and Disposal [Member] \| West Tier [Member]
Segment Reporting
Operating revenues	(2,497)	(2,392)
Operating Segments [Member] \| Collection and Disposal [Member] \| Other Ancillary [Member]
Segment Reporting
Operating revenues	(686)	(625)
Operating Segments [Member] \| Recycling Processing and Sales [Member]
Segment Reporting
Operating revenues	(436)	(374)
Operating Segments [Member] \| WM Renewable Energy [Member]
Segment Reporting
Operating revenues	(70)	(70)
Operating Segments [Member] \| Corporate and Other [Member]
Segment Reporting
Operating revenues	(12)	(12)
Intercompany Operating Revenues [Member]
Segment Reporting
Operating revenues	1,158	1,142
Intercompany Operating Revenues [Member] \| Collection and Disposal [Member]
Segment Reporting
Operating revenues	1,083	1,055
Intercompany Operating Revenues [Member] \| Collection and Disposal [Member] \| East Tier {Member]
Segment Reporting
Operating revenues	535	516
Intercompany Operating Revenues [Member] \| Collection and Disposal [Member] \| West Tier [Member]
Segment Reporting
Operating revenues	504	495
Intercompany Operating Revenues [Member] \| Collection and Disposal [Member] \| Other Ancillary [Member]
Segment Reporting
Operating revenues	44	44
Intercompany Operating Revenues [Member] \| Recycling Processing and Sales [Member]
Segment Reporting
Operating revenues	68	80
Intercompany Operating Revenues [Member] \| WM Renewable Energy [Member]
Segment Reporting
Operating revenues	1	1
Intercompany Operating Revenues [Member] \| Corporate and Other [Member]
Segment Reporting
Operating revenues	$ 6	$ 6

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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