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Common Stock And Share-Based Compensation (Restricted Stock Units) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Common Stock And Share-Based Compensation [Abstract]      
Restricted stock units terms, percentage of shares to vest 20.00%pcg_RestrictedStockUnitsTermsPercentageOfSharesToVest    
Restricted stock units terms, percentage of shares to vest, remaining percentage 40.00%pcg_RestrictedStockUnitsTermsPercentageOfSharesToVestRemainingPercentage    
Weighted average grant-date fair value of RSU's $ 43.76pcg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsRsusGrantedInPeriodWeightedAverageGrantDateFairValue $ 42.92pcg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsRsusGrantedInPeriodWeightedAverageGrantDateFairValue $ 42.17pcg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsRsusGrantedInPeriodWeightedAverageGrantDateFairValue
Total fair value $ 34pcg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentRsusVestedInPeriodTotalFairValue $ 30pcg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentRsusVestedInPeriodTotalFairValue $ 18pcg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentRsusVestedInPeriodTotalFairValue
Total unrecognized compensation costs $ 51pcg_EmployeeServiceShareBasedCompensationNonvestedRestrictedStockUnitsTotalCompensationCostNotYetRecognized    
Remaining weighted average period, Years 1 year 9 months 0 days    
Nonvested at January 1, Number of Restricted Stock Units 2,300,021pcg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsRsusNonvestedNumber    
Granted, Number of Restricted Stock Units 1,092,035pcg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsRsusGrantsInPeriod    
Vested, Number of Restricted Stock Units (777,883)pcg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsRsusVestedInPeriod    
Forfeited, Number of Restricted Stock Units (75,816)pcg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsRsusForfeitedInPeriod    
Nonvested at December 31, Number of Restricted Stock Units 2,538,357pcg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsRsusNonvestedNumber 2,300,021pcg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsRsusNonvestedNumber  
Nonvested at January 1, Weighted Average Grant-Date Fair Value $ 43.16pcg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsRsusNonvestedWeightedAverageGrantDateFairValue    
Granted, Weighted Average Grant Date Fair Value $ 43.76pcg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsRsusGrantsInPeriodWeightedAverageGrantDateFairValue    
Vested, Weighted Average Grant Date Fair Value $ 43.28pcg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsRsusVestedInPeriodWeightedAverageGrantDateFairValue    
Forfeited, Weighted Average Grant Date Fair Value $ 43.01pcg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsRsusForfeitedInPeriodWeightedAverageGrantDateFairValue    
Nonvested at December 31, Weighted Average Grant-Date Fair Value $ 43.38pcg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsRsusNonvestedWeightedAverageGrantDateFairValue $ 43.16pcg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsRsusNonvestedWeightedAverageGrantDateFairValue