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Landfill and Environmental Remediation Liabilities - Summary (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Landfill and environmental remediation liabilities    
Total, Environmental Remediation $ 237  
Current (in accrued liabilities) 169 $ 156
Long-term 1,828 1,770
Total 1,997 1,926
Landfill [Member]    
Landfill and environmental remediation liabilities    
Current (in accrued liabilities), Landfill 143 128
Long-term, Landfill 1,617 1,547
Total, Landfill 1,760 1,675
Environmental Remediation Liabilities [Member]    
Landfill and environmental remediation liabilities    
Current (in accrued liabilities), Environmental Remediation 26 28
Long-term, Environmental Remediation 211 223
Total, Environmental Remediation $ 237 $ 251