Goodwill and Other Intangible Assets - Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Goodwill
Contingent consideration liability increase (decrease)		$ (46)
Goodwill increase (decrease)	$ 4,184
Noncontrolling interest goodwill		22
Goodwill roll forward
Goodwill, Beginning Balance	9,254	9,323
Acquired goodwill	4,221	90
Divested goodwill	(4)
Impairments	0	(168)
Foreign currency translation and other	(33)	9
Goodwill, Ending Balance	13,438	9,254
Collection and Disposal Segment [Member] | East Tier {Member]
Goodwill roll forward
Goodwill, Beginning Balance	5,094	5,072
Acquired goodwill	553	13
Foreign currency translation and other	(32)	9
Goodwill, Ending Balance	5,615	5,094
Collection and Disposal Segment [Member] | West Tier [Member]
Goodwill roll forward
Goodwill, Beginning Balance	3,766	3,696
Acquired goodwill	30	70
Divested goodwill	(4)
Goodwill, Ending Balance	3,792	3,766
Collection and Disposal Segment [Member] | Other Ancillary [Member]
Goodwill roll forward
Goodwill, Beginning Balance	27	27
Goodwill, Ending Balance	27	27
Recycling Processing and Sales [Member]
Goodwill roll forward
Goodwill, Beginning Balance	366	527
Acquired goodwill	5	7
Impairments		(168)
Foreign currency translation and other	(1)
Goodwill, Ending Balance	370	366
WM Healthcare Solutions [Member]
Goodwill roll forward
Acquired goodwill	3,633
Goodwill, Ending Balance	3,633
Corporate and Other [Member]
Goodwill roll forward
Goodwill, Beginning Balance	1	1
Goodwill, Ending Balance	$ 1	$ 1