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Derivatives And Other Financial Instruments (Schedule Of Fair Values Of Outstanding Derivative Contracts Recorded As Liabilities) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value liability derivatives $ 737 $ 865
Derivatives Designated As Hedging Instruments [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value liability derivatives 653 736
Derivatives Not Designated As Hedging Instruments [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value liability derivatives 85 170
Other Current Liabilities [Member] | Aluminum Contracts [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value liability derivatives 1 4
Other Current Liabilities [Member] | Energy Contracts [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value liability derivatives   37
Other Current Liabilities [Member] | Derivatives Designated As Hedging Instruments [Member] | Aluminum Contracts [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value liability derivatives 79 89
Other Current Liabilities [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Aluminum Contracts [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value liability derivatives 35 52
Other Current Liabilities [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Energy Contracts [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value liability derivatives   62
Other Noncurrent Liabilities [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value liability derivatives 1 41
Other Noncurrent Liabilities [Member] | Derivatives Designated As Hedging Instruments [Member] | Aluminum Contracts [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value liability derivatives 574 647
Other Noncurrent Liabilities [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Aluminum Contracts [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value liability derivatives 22 33
Other Noncurrent Liabilities [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Embedded Credit Derivative [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value liability derivatives $ 28 $ 23