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Derivatives (Additional Cash Collateral The Utility Would Be Required To Post If Its Credit Risk-Related Contingency Features Were Triggered) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Derivatives [Abstract]  
Derivatives in a liability position with credit risk-related contingencies that are not fully collateralized $ (134)
Related derivatives in an asset position 2
Collateral posting in the normal course of business related to these derivatives 33
Net position of derivative contracts/additional collateral posting requirements $ (99) [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.