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Employee Benefit Plans (Schedule Of Assumed Health Care Cost Trend) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Employee Benefit Plans [Abstract]  
Effect on postretirement benefit obligation, One-Percentage-Point Increase $ 107us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation
Effect on postretirement benefit obligation, One-Percentage-Point Decrease (108)us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1
Effect on service and interest cost, One-Percentage-Point Increase 8us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents
Effect on service and interest cost, One-Percentage-Point Decrease $ (8)us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1
Assumed health care cost trend rate 7.50%pcg_DefinedBenefitPlanHealthCareCostTrendRateAssumedForCurrentFiscalYear
Ultimate trend rate 3.50%us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate
Year of ultimate trend rate 2024
Assumed return 6.20%pcg_DefinedBenefitPlanExpectedReturnOnPlanAssetsPercentage
10 year actual rate of return 9.30%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
Number of Aa-grade non-callable bonds used to develop the yield curve for rate used 715pcg_DefinedBenefitPlanNumberOfAaGradeNonCallableBondsUsedToDevelopYieldCurveForRateUsed