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(Gain) Loss from Divestitures, Asset Impairments and Unusual Items, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Recycling Processing and Sales [Member] \| Accelerating film and plastic wrap recycling capabilities company [Member] \| Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Asset Impairments and Unusual Items
Asset impairments	$ 152
Other Ancillary [Member] \| Oil recovery and sludge processing services [Member]
Asset Impairments and Unusual Items
Goodwill impairment			$ 16
East Tier {Member] \| Landfill Closure [Member] \| Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Asset Impairments and Unusual Items
Asset impairments	45
WM Renewable Energy [Member] \| Early Contract Termination [Member] \| Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Asset Impairments and Unusual Items
(Gain) loss from divestitures, asset impairments and unusual items, net	$ 11
Corporate Segment and Other Operating Segment [Member] \| Waste Diversion Technology Company [Member]
Asset Impairments and Unusual Items
Asset impairments				$ 54
Corporate Segment and Other Operating Segment [Member] \| Medical waste company [Member] \| Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Asset Impairments and Unusual Items
Gain (loss) on sale of assets		$ (14)