Segment and Related Information - Revenue mix (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Segment revenue
Operating revenues	$ 6,684	$ 6,430	$ 12,911	$ 12,448
Collection and Disposal [Member]
Segment revenue
Operating revenues	5,479	5,281
Collection [Member]
Segment revenue
Operating revenues	4,065	3,856	7,934	7,602
Commercial [Member]
Segment revenue
Operating revenues	1,485	1,398	2,914	2,778
Industrial [Member]
Segment revenue
Operating revenues	820	790	1,578	1,531
Residential [Member]
Segment revenue
Operating revenues	911	872	1,799	1,744
Other Collection [Member]
Segment revenue
Operating revenues	849	796	1,643	1,549
Landfill [Member]
Segment revenue
Operating revenues	1,004	1,036	1,868	1,876
Transfer [Member]
Segment revenue
Operating revenues	410	389	758	725
Recycling Processing and Sales [Member]
Segment revenue
Operating revenues	403	381
Renewable Energy [Member]
Segment revenue
Operating revenues	157	115
Healthcare Solutions [Member]
Segment revenue
Operating revenues	638	646	1,252	1,265
Corporate and other [Member]
Segment revenue
Operating revenues	7	7
Operating Segments [Member]
Segment revenue
Operating revenues	8,187	7,888	15,812	15,214
Operating Segments [Member] \| Collection and Disposal [Member]
Segment revenue
Operating revenues	6,782	6,516
Operating Segments [Member] \| Collection [Member]
Segment revenue
Operating revenues	4,639	4,389	9,049	8,642
Operating Segments [Member] \| Commercial [Member]
Segment revenue
Operating revenues	1,721	1,618	3,379	3,212
Operating Segments [Member] \| Industrial [Member]
Segment revenue
Operating revenues	1,065	1,013	2,045	1,953
Operating Segments [Member] \| Residential [Member]
Segment revenue
Operating revenues	930	894	1,836	1,788
Operating Segments [Member] \| Other Collection [Member]
Segment revenue
Operating revenues	923	864	1,789	1,689
Operating Segments [Member] \| Landfill [Member]
Segment revenue
Operating revenues	1,433	1,446	2,679	2,639
Operating Segments [Member] \| Transfer [Member]
Segment revenue
Operating revenues	710	681	1,329	1,273
Operating Segments [Member] \| Recycling Processing and Sales [Member]
Segment revenue
Operating revenues	491	482
Operating Segments [Member] \| Renewable Energy [Member]
Segment revenue
Operating revenues	157	115
Operating Segments [Member] \| Healthcare Solutions [Member]
Segment revenue
Operating revenues	742	760	1,463	1,481
Operating Segments [Member] \| Corporate and other [Member]
Segment revenue
Operating revenues	15	15
Intercompany Elimination [Member]
Segment revenue
Operating revenues	1,503	1,458	2,901	2,766
Intercompany Elimination [Member] \| Collection and Disposal [Member]
Segment revenue
Operating revenues	1,303	1,235
Intercompany Elimination [Member] \| Collection [Member]
Segment revenue
Operating revenues	574	533	1,115	1,040
Intercompany Elimination [Member] \| Commercial [Member]
Segment revenue
Operating revenues	236	220	465	434
Intercompany Elimination [Member] \| Industrial [Member]
Segment revenue
Operating revenues	245	223	467	422
Intercompany Elimination [Member] \| Residential [Member]
Segment revenue
Operating revenues	19	22	37	44
Intercompany Elimination [Member] \| Other Collection [Member]
Segment revenue
Operating revenues	74	68	146	140
Intercompany Elimination [Member] \| Landfill [Member]
Segment revenue
Operating revenues	429	410	811	763
Intercompany Elimination [Member] \| Transfer [Member]
Segment revenue
Operating revenues	300	292	571	548
Intercompany Elimination [Member] \| Recycling Processing and Sales [Member]
Segment revenue
Operating revenues	88	101
Intercompany Elimination [Member] \| Healthcare Solutions [Member]
Segment revenue
Operating revenues	104	114	$ 211	$ 216
Intercompany Elimination [Member] \| Corporate and other [Member]
Segment revenue
Operating revenues	$ 8	$ 8