Segment and Related Information - Summary (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($) segment	Mar. 31, 2024 USD ($)
Segment Reporting
Number of reportable segments | segment	5
Net operating revenue royalty (as a percent)	15.00%
Royalty amount	$ 14	$ 10
Operating revenues	6,018	5,159
Operating expenses	3,647	3,140
Selling, general and administrative	687	491
Other net expenses	15	(2)
Depreciation, depletion and amortization	656	514
Income from operations	1,013	1,016
Capital expenditures	641	553
Collection and Disposal [Member]
Segment Reporting
Operating revenues	4,922	4,716
Other net expenses		(2)
Depreciation, depletion and amortization	477	450
Income from operations	1,328	1,279
Capital expenditures	436	389
East Tier [Member]
Segment Reporting
Operating revenues	2,140	2,081
Depreciation, depletion and amortization	251	241
Income from operations	661	654
Capital expenditures	197	176
West Tier [Member]
Segment Reporting
Operating revenues	2,082	1,993
Depreciation, depletion and amortization	219	204
Income from operations	670	627
Capital expenditures	222	201
Other Ancillary [Member]
Segment Reporting
Operating revenues	700	642
Other net expenses		(2)
Depreciation, depletion and amortization	7	5
Income from operations	(3)	(2)
Capital expenditures	17	12
Recycling Processing and Sales [Member]
Segment Reporting
Operating revenues	384	368
Other net expenses	5
Depreciation, depletion and amortization	39	29
Income from operations	18	19
Capital expenditures	38	87
WM Renewable Energy [Member]
Segment Reporting
Operating revenues	91	69
Depreciation, depletion and amortization	15	8
Income from operations	19	21
Capital expenditures	122	91
WM Healthcare Solutions [Member]
Segment Reporting
Operating revenues	619
Other net expenses	9
Depreciation, depletion and amortization	101
Income from operations	(25)
Capital expenditures	34
Corporate and Other [Member]
Segment Reporting
Operating revenues	2	6
Other net expenses	1
Depreciation, depletion and amortization	24	27
Income from operations	(327)	(303)
Capital expenditures	11	(14)
Operating Segments [Member]
Segment Reporting
Operating revenues	7,232	6,291
Operating expenses	4,856	4,267
Selling, general and administrative	692	496
Operating Segments [Member] | Collection and Disposal [Member]
Segment Reporting
Operating revenues	6,038	5,774
Operating expenses	4,027	3,838
Selling, general and administrative	206	209
Operating Segments [Member] | Collection and Disposal [Member] | Processing fees [Member]
Segment Reporting
Income from operations	20	22
Operating Segments [Member] | East Tier [Member]
Segment Reporting
Operating revenues	2,698	2,608
Operating expenses	1,696	1,624
Selling, general and administrative	90	89
Operating Segments [Member] | West Tier [Member]
Segment Reporting
Operating revenues	2,588	2,480
Operating expenses	1,613	1,558
Selling, general and administrative	86	91
Operating Segments [Member] | Other Ancillary [Member]
Segment Reporting
Operating revenues	752	686
Operating expenses	718	656
Selling, general and administrative	30	29
Operating Segments [Member] | Recycling Processing and Sales [Member]
Segment Reporting
Operating revenues	465	436
Operating expenses	388	374
Selling, general and administrative	15	14
Operating Segments [Member] | WM Renewable Energy [Member]
Segment Reporting
Operating revenues	92	70
Operating expenses	55	39
Selling, general and administrative	3	2
Operating Segments [Member] | WM Healthcare Solutions [Member]
Segment Reporting
Operating revenues	627
Operating expenses	386
Selling, general and administrative	156
Operating Segments [Member] | Corporate and Other [Member]
Segment Reporting
Operating revenues	10	11
Operating expenses		16
Selling, general and administrative	312	271
Intercompany Elimination [Member]
Segment Reporting
Operating revenues	1,214	1,132
Operating expenses	1,209	1,127
Selling, general and administrative	(5)	(5)
Intercompany Elimination [Member] | Collection and Disposal [Member]
Segment Reporting
Operating revenues	1,116	1,058
Intercompany Elimination [Member] | East Tier [Member]
Segment Reporting
Operating revenues	558	527
Intercompany Elimination [Member] | West Tier [Member]
Segment Reporting
Operating revenues	506	487
Intercompany Elimination [Member] | Other Ancillary [Member]
Segment Reporting
Operating revenues	52	44
Intercompany Elimination [Member] | Recycling Processing and Sales [Member]
Segment Reporting
Operating revenues	81	68
Intercompany Elimination [Member] | WM Renewable Energy [Member]
Segment Reporting
Operating revenues	1	1
Intercompany Elimination [Member] | WM Healthcare Solutions [Member]
Segment Reporting
Operating revenues	8
Intercompany Elimination [Member] | Corporate and Other [Member]
Segment Reporting
Operating revenues	$ 8	$ 5