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Landfill and Environmental Remediation Liabilities - Summary (Detail) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Landfill and Environmental Remediation Liabilities |  |
Total, Environmental Remediation | $ 217 |
Current (in accrued liabilities) | 235 | $ 231
Long-term | 3,086 | 3,048
Total | 3,321 | 3,279
Landfill [Member] |  |
Landfill and Environmental Remediation Liabilities |  |
Current (in accrued liabilities), Landfill | 180 | 177
Long-term, Landfill | 2,924 | 2,880
Total, Landfill | 3,104 | 3,057
Environmental Remediation Liabilities [Member] |  |
Landfill and Environmental Remediation Liabilities |  |
Current (in accrued liabilities), Environmental Remediation | $ 55 | $ 54
Environmental Loss Contingency, Current, Statement of Financial Position [Extensible Enumeration] | Accrued Liabilities, Current | Accrued Liabilities, Current
Long-term, Environmental Remediation | $ 162 | $ 168
Environmental Loss Contingency, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Long-term | Long-term
Total, Environmental Remediation | $ 217 | $ 222

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