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Contingencies and Commitments - Accrued Liabilities for Remediation Activities Included in Balance Sheet (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Commitments and Contingencies Disclosure [Line Items]    
Accounts payable, Deferred credits and other non-current liabilities $ 199 $ 203
Accounts Payable
   
Commitments and Contingencies Disclosure [Line Items]    
Accounts payable, Deferred credits and other non-current liabilities 17 21
Deferred credits and other noncurrent liabilities
   
Commitments and Contingencies Disclosure [Line Items]    
Accounts payable, Deferred credits and other non-current liabilities $ 182 $ 182