Landfill and Environmental Remediation Liabilities - Changes (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Mar. 31, 2022	Sep. 30, 2023
Landfill and environmental remediation liabilities
Revisions in estimates and interest rate assumptions	$ 17
Ending balance, environmental remediation		$ 185
Landfill [Member]
Landfill and environmental remediation liabilities
Beginning balance, landfill		2,664
Obligations incurred and capitalized		61
Obligations settled		(106)
Interest accretion		92
Revisions in estimates and interest rate assumptions		5
Ending balance, landfill		2,716
Environmental Remediation Liabilities [Member]
Landfill and environmental remediation liabilities
Beginning balance, environmental remediation		204
Obligations settled		(20)
Interest accretion		5
Revisions in estimates and interest rate assumptions		(4)
Ending balance, environmental remediation		$ 185

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

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