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Risk Management Activities and Derivative Transactions Collateral (Details) (Collateral, USD $)
3 Months Ended
Dec. 31, 2012
Collateral
 
Derivative  
Derivative, net liability position, aggregate fair value $ 1,600,000,000
Collateral obligations 1,100,000,000
Collateral already posted 1,100,000,000
Likely cash collateral obligation increase $ 45,000,000