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Derivatives and Other Financial Instruments - Schedule of Fair Values and Corresponding Level of Fair Value Hierarchy of Outstanding Derivative Contracts Recorded as Assets (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]      
Fair value asset derivatives $ 249 $ 390 $ 596
Level 1 [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Fair value asset derivatives 8 6  
Level 3 [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Fair value asset derivatives 217 355  
Level 2 [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Fair value asset derivatives 27 32  
Derivatives Designated as Hedging Instruments [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Fair value asset derivatives 48 69  
Derivatives Designated as Hedging Instruments [Member] | Prepaid Expenses and Other Current Assets [Member] | Aluminum Contracts [Member] | Level 1 [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Fair value asset derivatives 8 4  
Derivatives Designated as Hedging Instruments [Member] | Prepaid Expenses and Other Current Assets [Member] | Aluminum Contracts [Member] | Level 3 [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Fair value asset derivatives 5 9  
Derivatives Designated as Hedging Instruments [Member] | Prepaid Expenses and Other Current Assets [Member] | Foreign Exchange Contracts [Member] | Level 1 [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Fair value asset derivatives   2  
Derivatives Designated as Hedging Instruments [Member] | Prepaid Expenses and Other Current Assets [Member] | Interest Rate Contracts [Member] | Level 2 [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Fair value asset derivatives 6 9  
Derivatives Designated as Hedging Instruments [Member] | Other Noncurrent Assets [Member] | Aluminum Contracts [Member] | Level 3 [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Fair value asset derivatives 8 16  
Derivatives Designated as Hedging Instruments [Member] | Other Noncurrent Assets [Member] | Interest Rate Contracts [Member] | Level 2 [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Fair value asset derivatives 21 23  
Derivatives Designated as Hedging Instruments [Member] | Other Noncurrent Assets [Member] | Energy Contracts [Member] | Level 3 [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Fair value asset derivatives   6  
Derivatives Not Designated as Hedging Instruments [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Fair value asset derivatives 204 324  
Derivatives Not Designated as Hedging Instruments [Member] | Prepaid Expenses and Other Current Assets [Member] | Aluminum Contracts [Member] | Level 3 [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Fair value asset derivatives 104 149  
Derivatives Not Designated as Hedging Instruments [Member] | Other Noncurrent Assets [Member] | Aluminum Contracts [Member] | Level 3 [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Fair value asset derivatives 100 175  
Margin Held [Member] | Prepaid Expenses and Other Current Assets [Member] | Aluminum Contracts [Member] | Level 1 [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Fair value asset derivatives 3    
Margin Held [Member] | Prepaid Expenses and Other Current Assets [Member] | Interest Rate Contracts [Member] | Level 2 [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Fair value asset derivatives   3  
Margin Held [Member] | Prepaid Expenses and Other Current Assets [Member] | Subtotal [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Fair value asset derivatives $ 3 $ 3