Segment and Related Information - Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting
Total assets	$ 44,567	$ 32,823
Operating Segments [Member] | Collection and Disposal [Member]
Segment Reporting
Total assets	27,893	26,433
Operating Segments [Member] | Collection and Disposal [Member] | East Tier {Member]
Segment Reporting
Total assets	15,328	14,328
Operating Segments [Member] | Collection and Disposal [Member] | West Tier [Member]
Segment Reporting
Total assets	11,786	11,322
Operating Segments [Member] | Collection and Disposal [Member] | Other Ancillary [Member]
Segment Reporting
Total assets	779	783
Operating Segments [Member] | Recycling Processing and Sales [Member]
Segment Reporting
Total assets	2,686	2,282
Operating Segments [Member] | WM Renewable Energy [Member]
Segment Reporting
Total assets	1,544	1,077
Operating Segments [Member] | WM Healthcare Solutions [Member]
Segment Reporting
Total assets	9,406
Operating Segments [Member] | Corporate and Other [Member]
Segment Reporting
Total assets	3,785	3,392
Elimination of intercompany investments and advances [Member]
Segment Reporting
Total assets	$ (747)	$ (361)