Landfill and Environmental Remediation Liabilities - Changes (Detail) $ in Millions	3 Months Ended
Mar. 31, 2025 USD ($)
Landfill and Environmental Remediation Liabilities
Ending balance, environmental remediation	$ 219
Landfill [Member]
Landfill and Environmental Remediation Liabilities
Beginning balance, landfill	3,057
Obligations incurred and capitalized	19
Obligations settled	(22)
Interest accretion	35
Ending balance, landfill	3,089
Environmental Remediation Liabilities [Member]
Landfill and Environmental Remediation Liabilities
Beginning balance, environmental remediation	222
Obligations settled	(5)
Revisions in estimates and interest rate assumptions	2
Ending balance, environmental remediation	$ 219

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

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