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Financial Risk Management Activities (Schedule Of Derivative Transactions Designated And Effective As Cash Flow Hedges) (Details) (Power [Member], USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Power [Member]
Fair Value of Cash Flow Hedges	$ 101	$ 196
Impact on Accumulated Other Comprehensive Income (Loss) (after tax)	$ 57	$ 114

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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