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Derivatives and Other Financial Instruments - Gross Amounts of Recognized Derivative Assets and Liabilities and Gross Amounts Offset in Accompanying Consolidated Balance Sheet (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Gross amounts recognized, Assets $ 74 $ 72
Gross amounts offset, Assets (42) (39)
Net amounts presented in Consolidated Balance Sheet, Assets 32 33
Gross amounts recognized, Liabilities 49 84
Gross amounts offset, Liabilities (42) (39)
Net amounts presented in Consolidated Balance Sheet, Liabilities 7 45
Aluminum Contracts [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Gross amounts recognized, Assets 47 40
Gross amounts offset, Assets (42) (36)
Net amounts presented in Consolidated Balance Sheet, Assets 5 4
Gross amounts recognized, Liabilities 49 81
Gross amounts offset, Liabilities (42) (36)
Net amounts presented in Consolidated Balance Sheet, Liabilities 7 45
Interest Rate Contracts [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Gross amounts recognized, Assets 27 32
Gross amounts offset, Assets   (3)
Net amounts presented in Consolidated Balance Sheet, Assets 27 29
Gross amounts recognized, Liabilities   3
Gross amounts offset, Liabilities   (3)
Net amounts presented in Consolidated Balance Sheet, Liabilities $ 0 $ 0