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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, 2016
Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value asset derivatives $ 317 $ 1,137
Fair value liability derivatives 296 208
Derivatives Designated as Hedging Instruments [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value asset derivatives 317 1,068
Fair value liability derivatives 272 173
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 40 72
Derivatives Designated as Hedging Instruments [Member] | Prepaid Expenses and Other Current Assets [Member] | Energy Contracts [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value asset derivatives 7  
Derivatives Designated as Hedging Instruments [Member] | Other Noncurrent Assets [Member] | Embedded Aluminum Derivative [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value asset derivatives 270 994
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 25 9
Derivatives Designated as Hedging Instruments [Member] | Other Current Liabilities [Member] | Energy Contracts [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value liability derivatives   4
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 247 160
Derivatives Not Designated as Hedging Instruments [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value asset derivatives   69
Fair value liability derivatives 24 35
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   69
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 6
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 $ 20 $ 29