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Landfill and Environmental Remediation Liabilities - Summary (Detail) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Landfill and environmental remediation liabilities |  |
Total, Environmental Remediation | $ 233 |
Current (in accrued liabilities) | 158 | $ 169
Long-term | 1,866 | 1,828
Total | 2,024 | 1,997
Landfill [Member] |  |
Landfill and environmental remediation liabilities |  |
Current (in accrued liabilities), Landfill | 132 | 143
Long-term, Landfill | 1,659 | 1,617
Total, Landfill | 1,791 | 1,760
Environmental Remediation Liabilities [Member] |  |
Landfill and environmental remediation liabilities |  |
Current (in accrued liabilities), Environmental Remediation | 26 | 26
Long-term, Environmental Remediation | 207 | 211
Total, Environmental Remediation | $ 233 | $ 237

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