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Hedging Activities (Schedule of Derivative Credit Risk And Fair Value) (Details) (USD $)
In Millions
Sep. 30, 2011
Hedging Activities [Abstract] 
Net derivative liability with counterparties$ 75
Collateral posted by the Company2[1]
Potential loss related to the failure of the Company's counterparties to perform$ 1
[1]Classified as a current receivable.