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Derivatives And Hedging Activities (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
Dec. 31, 2014
Dec. 31, 2013
Derivatives And Hedging Activities [Abstract]    
Derivatives in a liability position with credit risk-related contingencies that are not fully collateralized $ (47)pcg_DerivativesCreditRiskRelatedContingenciesLiabilityPosition $ (79)pcg_DerivativesCreditRiskRelatedContingenciesLiabilityPosition
Related derivatives in an asset position 0pcg_DerivativesCreditRiskRelatedContingenciesAssetPosition 4pcg_DerivativesCreditRiskRelatedContingenciesAssetPosition
Collateral posting in the normal course of business related to these derivatives 44us-gaap_CollateralAlreadyPostedAggregateFairValue 65us-gaap_CollateralAlreadyPostedAggregateFairValue
Net position of derivative contracts/additional collateral posting requirements $ (3)us-gaap_AdditionalCollateralAggregateFairValue [1] $ (10)us-gaap_AdditionalCollateralAggregateFairValue [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.