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Landfill and Environmental Remediation Liabilities - Liabilities for Landfill and Environmental Remediation Costs (Detail) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Site Contingency [Line Items]    
Total, Environmental Remediation $ 207  
Current (in accrued liabilities) 142 $ 143
Long-term 1,606 1,584
Total 1,748 1,727
Landfill [Member]    
Site Contingency [Line Items]    
Current (in accrued liabilities), Landfill 110 112
Long-term, Landfill 1,431 1,406
Total, Landfill 1,541 1,518
Environmental Remediation Liabilities [Member]    
Site Contingency [Line Items]    
Current (in accrued liabilities), Environmental Remediation 32 31
Long-term, Environmental Remediation 175 178
Total, Environmental Remediation $ 207 $ 209