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Landfill and Environmental Remediation Liabilities - Changes to Landfill and Environmental Remediation Liabilities (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Environmental Remediation Liabilities [Member]
Dec. 31, 2012
Environmental Remediation Liabilities [Member]
Sep. 30, 2013
Landfill Liabilities [Member]
Dec. 31, 2012
Landfill Liabilities [Member]
Environmental Exit Cost [Line Items]            
Beginning balance, landfill         $ 1,338 $ 1,292
Beginning balance, environmental remediation     253 273    
Obligations incurred and capitalized         45 58
Obligations settled         (53) (87)
Obligations settled     (15) (30)    
Interest accretion 65 62     65 84
Interest accretion     3 4    
Revisions in cost estimates and interest rate assumptions            (8)
Revisions in cost estimates and interest rate assumptions     (4) 5    
Acquisitions, divestitures and other adjustments         3 (1)
Acquisitions, divestitures and other adjustments     (1) 1    
Ending balance, landfill         1,398 1,338
Ending balance, environmental remediation $ 236   $ 236 $ 253