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Derivatives and Other Financial Instruments - Schedule of Fair Value Gains and Losses on Derivatives Contracts Recorded in Earnings (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain or (Loss) Recognized in Earnings on Derivatives $ (10) $ 13
Aluminum Contracts [Member] | Sales [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain or (Loss) Recognized in Earnings on Derivatives (5) (4)
Aluminum Contracts [Member] | Other Expenses (Income), Net [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain or (Loss) Recognized in Earnings on Derivatives   22
Embedded Credit Derivative [Member] | Other Expenses (Income), Net [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain or (Loss) Recognized in Earnings on Derivatives 1 (2)
Foreign Exchange Contracts [Member] | Other Expenses (Income), Net [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain or (Loss) Recognized in Earnings on Derivatives $ (6) $ (3)