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Derivatives and Hedging Activities (Additional Cash Collateral the Utility Would be Required to Post if its Credit-Risk-Related Contingent Features were Triggered) (Details) (USD $)
In Millions
Jun. 30, 2011
Derivatives and Hedging Activities  
Derivatives in a liability position with credit-risk-related contingencies that are not fully collateralized $ (464)
Related derivatives in an asset position 4
Collateral posting in the normal course of business related to these derivatives 12
Net position of derivative contracts/additional collateral posting requirements $ (448) [1]
[1] This calculation excludes the impact of closed but unpaid positions, as their settlement is not impacted by any of the Utility's credit risk-related contingencies.