Landfill and Environmental Remediation Liabilities - Changes (Detail) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Landfill and environmental remediation liabilities
Ending balance, environmental remediation	$ 200
San Jacinto Waste Pits [Member]
Landfill and environmental remediation liabilities
Beginning balance, environmental remediation	68
Revisions in estimates and interest rate assumptions		$ 17
Ending balance, environmental remediation	69
Landfill [Member]
Landfill and environmental remediation liabilities
Beginning balance, landfill	2,664
Obligations incurred and capitalized	20
Obligations settled	(22)
Interest accretion	30
Revisions in estimates and interest rate assumptions	5
Ending balance, landfill	2,697
Environmental Remediation Liabilities [Member]
Landfill and environmental remediation liabilities
Beginning balance, environmental remediation	204
Obligations settled	(6)
Interest accretion	2
Ending balance, environmental remediation	$ 200

Total costs accrued as of the balance sheet date for environmental loss contingencies.

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