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Landfill and Environmental Remediation Liabilities - Summary (Detail) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Landfill and Environmental Remediation Liabilities |  |
Total, Environmental Remediation | $ 215 |
Current (in accrued liabilities) | 218 | $ 231
Long-term | 3,132 | 3,048
Total | 3,350 | 3,279
Landfill [Member] |  |
Landfill and Environmental Remediation Liabilities |  |
Current (in accrued liabilities), Landfill | 184 | 177
Long-term, Landfill | 2,951 | 2,880
Total, Landfill | 3,135 | 3,057
Environmental Remediation Liabilities [Member] |  |
Landfill and Environmental Remediation Liabilities |  |
Current (in accrued liabilities), Environmental Remediation | $ 34 | $ 54
Environmental Loss Contingency, Current, Statement of Financial Position [Extensible Enumeration] | Accrued Liabilities, Current | Accrued Liabilities, Current
Long-term, Environmental Remediation | $ 181 | $ 168
Environmental Loss Contingency, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Long-term | Long-term
Total, Environmental Remediation | $ 215 | $ 222

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