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Contingencies and Commitments - Accrued Liabilities for Remediation Activities Included in Balance Sheet (Detail) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Loss Contingencies [Line Items]    
Total $ 203 $ 212
Accounts payable    
Loss Contingencies [Line Items]    
Total 19 19
Deferred credits and other noncurrent liabilities    
Loss Contingencies [Line Items]    
Total $ 184 $ 193