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Landfill and Environmental Remediation Liabilities - Liabilities for Landfill and Environmental Remediation Costs (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Site Contingency [Line Items]      
Total, Environmental Remediation $ 246    
Current (in accrued liabilities) 147 $ 143  
Long-term 1,675 1,584  
Total 1,822 1,727  
Landfill [Member]      
Site Contingency [Line Items]      
Current (in accrued liabilities), Landfill 119 112  
Long-term, Landfill 1,457 1,406  
Total, Landfill 1,576 1,518 $ 1,443
Environmental Remediation Liabilities [Member]      
Site Contingency [Line Items]      
Current (in accrued liabilities), Environmental Remediation 28 31  
Long-term, Environmental Remediation 218 178  
Total, Environmental Remediation $ 246 $ 209 $ 235