Segment and Related Information - Assets (Detail) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Segment Reporting
Total assets	$ 46,441	$ 45,835
Operating Segments [Member] \| Collection and Disposal [Member]
Segment Reporting
Total assets	29,332	29,145
Operating Segments [Member] \| East Tier [Member]
Segment Reporting
Total assets	15,906	16,099
Operating Segments [Member] \| West Tier [Member]
Segment Reporting
Total assets	12,608	12,245
Operating Segments [Member] \| Other Ancillary [Member]
Segment Reporting
Total assets	818	801
Operating Segments [Member] \| Recycling Processing and Sales [Member]
Segment Reporting
Total assets	2,841	2,718
Operating Segments [Member] \| Renewable Energy [Member]
Segment Reporting
Total assets	2,032	1,976
Operating Segments [Member] \| Healthcare Solutions [Member]
Segment Reporting
Total assets	8,758	9,002
Operating Segments [Member] \| Corporate and Other [Member]
Segment Reporting
Total assets	4,075	3,888
Intercompany Elimination [Member]
Segment Reporting
Total assets	$ (597)	$ (894)