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Hedging Activities (Schedule Of Derivative Credit Risk And Fair Value) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Hedging Activities [Abstract]    
Net derivative assets with counterparties $ 73 $ 375
Collateral held by the Company   63 [1]
Potential loss related to the failure of the Company's counterparties to perform $ 73 $ 312
[1] Classified as an other current liability.