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Derivatives and Other Financial Instruments - Schedule of Fair Values of Level 3 Derivative Instruments Recorded as Assets and Liabilities (Detail) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value asset derivatives $ 875 $ 268
Fair value liability derivatives 260 394
Derivatives Designated as Hedging Instruments [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value asset derivatives 788 99
Fair value liability derivatives 228 376
Derivatives Designated as Hedging Instruments [Member] | Prepaid Expenses and Other Current Assets [Member] | Embedded Aluminum Derivative [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value asset derivatives 70 24
Derivatives Designated as Hedging Instruments [Member] | Other Noncurrent Assets [Member] | Embedded Aluminum Derivative [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value asset derivatives 718 73
Derivatives Designated as Hedging Instruments [Member] | Other Noncurrent Assets [Member] | Energy Contracts [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value asset derivatives   2
Derivatives Designated as Hedging Instruments [Member] | Other Current Liabilities [Member] | Embedded Aluminum Derivative [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value liability derivatives 11 24
Derivatives Designated as Hedging Instruments [Member] | Other Noncurrent Liabilities and Deferred Credits [Member] | Embedded Aluminum Derivative [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value liability derivatives 213 352
Derivatives Designated as Hedging Instruments [Member] | Other Noncurrent Liabilities and Deferred Credits [Member] | Energy Contracts [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value liability derivatives 4  
Derivatives Not Designated as Hedging Instruments [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value asset derivatives 87 169
Fair value liability derivatives 32 18
Derivatives Not Designated as Hedging Instruments [Member] | Prepaid Expenses and Other Current Assets [Member] | Embedded Aluminum Derivative [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value asset derivatives 87 98
Derivatives Not Designated as Hedging Instruments [Member] | Other Noncurrent Assets [Member] | Embedded Aluminum Derivative [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value asset derivatives   71
Derivatives Not Designated as Hedging Instruments [Member] | Other Current Liabilities [Member] | Embedded Credit Derivative [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value liability derivatives 4 2
Derivatives Not Designated as Hedging Instruments [Member] | Other Noncurrent Liabilities and Deferred Credits [Member] | Embedded Credit Derivative [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value liability derivatives $ 28 $ 16