XML 68 R60.htm IDEA: XBRL DOCUMENT v2.4.0.6
Risk Management Activities and Derivative Transactions Collateral (Details) (Collateral, USD $)
6 Months Ended
Mar. 31, 2013
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 $ 22,000,000