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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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain or (Loss) Recognized in Earnings on Derivatives $ 9 $ (19) $ (1) $ (6)
Aluminum Contracts [Member] | Sales [Member]
        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain or (Loss) Recognized in Earnings on Derivatives 1 (3) (4) (7)
Aluminum Contracts [Member] | Other Expenses (Income), Net [Member]
        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain or (Loss) Recognized in Earnings on Derivatives (1) (7) (1) 15
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 6 (7) 7 (9)
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 $ 3 $ (2) $ (3) $ (5)