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Landfill and Environmental Remediation Liabilities - Liabilities for Landfill and Environmental Remediation Costs (Detail) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Site Contingency [Line Items] |  |
Total, Environmental Remediation | $ 245 |
Current (in accrued liabilities) | 164 | $ 147
Long-term | 1,712 | 1,675
Total | 1,876 | 1,822
Landfill [Member] |  |
Site Contingency [Line Items] |  |
Current (in accrued liabilities), Landfill | 138 | 119
Long-term, Landfill | 1,493 | 1,457
Total, Landfill | 1,631 | 1,576
Environmental Remediation Liabilities [Member] |  |
Site Contingency [Line Items] |  |
Current (in accrued liabilities), Environmental Remediation | 26 | 28
Long-term, Environmental Remediation | 219 | 218
Total, Environmental Remediation | $ 245 | $ 246

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