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Landfill and Environmental Remediation Liabilities - Summary (Detail) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Landfill and environmental remediation liabilities |  |
Total, Environmental Remediation | $ 237 |
Current (in accrued liabilities) | 158 | $ 156
Long-term | 1,832 | 1,770
Total | 1,990 | 1,926
Landfill [Member] |  |
Landfill and environmental remediation liabilities |  |
Current (in accrued liabilities), Landfill | 131 | 128
Long-term, Landfill | 1,622 | 1,547
Total, Landfill | 1,753 | 1,675
Environmental Remediation Liabilities [Member] |  |
Landfill and environmental remediation liabilities |  |
Current (in accrued liabilities), Environmental Remediation | 27 | 28
Long-term, Environmental Remediation | 210 | 223
Total, Environmental Remediation | $ 237 | $ 251

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