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Financial Risk Management Activities (Schedule Of Derivative Transactions Designated And Effective As Cash Flow Hedges) (Detail) (Power [Member], USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Power [Member]
   
Fair Value of Cash Flow Hedges $ 5 $ 57
Impact on Accumulated Other Comprehensive Income (Loss) (after tax) $ 23 $ 33