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Landfill and Environmental Remediation Liabilities - Summary (Detail) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Landfill and environmental remediation liabilities |  |
Total, Environmental Remediation | $ 238 |
Current (in accrued liabilities) | 129 | $ 165
Long-term | 2,037 | 1,930
Total | 2,166 | 2,095
Landfill [Member] |  |
Landfill and environmental remediation liabilities |  |
Current (in accrued liabilities), Landfill | 102 | 138
Long-term, Landfill | 1,826 | 1,717
Total, Landfill | 1,928 | 1,855
Environmental Remediation Liabilities [Member] |  |
Landfill and environmental remediation liabilities |  |
Current (in accrued liabilities), Environmental Remediation | 27 | 27
Long-term, Environmental Remediation | 211 | 213
Total, Environmental Remediation | $ 238 | $ 240

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