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Derivatives And Other Financial Instruments (Gains And Losses On Derivatives) (Details) (USD $)
In Millions
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)$ 149$ (248)$ 65$ (35)
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion)(32)(28)(114)(107)[1]
Amount of Gain or (Loss) Recognized in Earnings on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)4(2)41[2]
Amount of loss expected to be recognized into earnings over the next 12 months  22 
Loss recognized in earnings related to the amount excluded from the assessment of hedge effectiveness(1) (1) 
Gain recognized in earnings related to the amount excluded from the assessment of hedge effectiveness5 5 
Interest Expense [Member] | Interest Rate Contracts [Member]
    
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)(2) (2) 
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion)(2) (2) [1]
Amount of Gain or (Loss) Recognized in Earnings on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)    [2]
Sales [Member] | Aluminum Contracts [Member]
    
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)145(247)53(13)
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion)(30)(19)(106)(83)[1]
Sales [Member] | Foreign Exchange Contracts [Member]
    
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)244(3)
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion)2(2)4(6)[1]
Cost of Goods Sold [Member] | Energy Contract [Member]
    
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)6114(12)
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion)(2)(7)(8)(18)[1]
Amount of Gain or (Loss) Recognized in Earnings on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)    [2]
Other Expenses (Income), Net [Member] | Aluminum Contracts [Member]
    
Amount of Gain or (Loss) Recognized in Earnings on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)4(2)41[2]
Other Expenses (Income), Net [Member] | Energy Contract [Member]
    
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion) (6) (7)
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion)    [1]
Amount of Gain or (Loss) Recognized in Earnings on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)    [2]
Other Expenses (Income), Net [Member] | Foreign Exchange Contracts [Member]
    
Amount of Gain or (Loss) Recognized in Earnings on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)    [2]
Other Expenses (Income), Net [Member] | Interest Rate Contracts [Member]
    
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)(2) (4) 
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion)  (2) [1]
Amount of Gain or (Loss) Recognized in Earnings on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)    [2]
[1]Assuming market rates remain constant with the rates at September 30, 2011, a loss of $22 is expected to be recognized in earnings over the next 12 months.
[2]For both the third quarter and nine months ended September 30, 2011, the amount of gain or (loss) recognized in earnings represents $(1) related to the ineffective portion of the hedging relationships. There was also $5 recognized in earnings related to the amount excluded from the assessment of hedge effectiveness for both the third quarter and nine months ended September 30, 2011. For the third quarter and nine months ended September 30, 2010, the amount of gain or (loss) recognized in earnings related to the ineffective portion of the hedging relationships.