Landfill and Environmental Remediation Liabilities - Summary (Detail) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Landfill and environmental remediation liabilities
Total, Environmental Remediation	$ 216
Current (in accrued liabilities)	157	$ 166
Long-term	2,409	2,373
Total	2,566	2,539
Landfill [Member]
Landfill and environmental remediation liabilities
Current (in accrued liabilities), Landfill	128	137
Long-term, Landfill	2,222	2,189
Total, Landfill	2,350	2,326
Environmental Remediation Liabilities [Member]
Landfill and environmental remediation liabilities
Current (in accrued liabilities), Environmental Remediation	29	29
Long-term, Environmental Remediation	187	184
Total, Environmental Remediation	$ 216	$ 213