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Risk Management Activities and Derivative Transactions Collateral (Details) (Collateral, USD $)
9 Months Ended
Jun. 30, 2013
Collateral
 
Derivative  
Derivative, net liability position, aggregate fair value $ 1,300,000,000
Collateral obligations 1,000,000,000
Collateral already posted 1,000,000,000
Likely cash collateral obligation increase $ 22,000,000