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Equity (Narrative) (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Fees and commissions $ 1us-gaap_FeesAndCommissions
Equity Contract [Member]  
Equity Distribution Agreement, shares issued 1,400,000pcg_EquityDistributionAgreementShares
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquityContractMember
Equity distribution agreement amount 500pcg_EquityDistributionAgreementAmount
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquityContractMember
Stock Issued During Period Value Under Equity Distribution Agreement 74pcg_StockIssuedDuringPeriodValueUnderEquityDistributionAgreement
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquityContractMember
401K Plan, DRSPP, and Shared Based Compensation Plans [Member]  
Stock issued during period for stock options exercised and under 401(K) plan and DRSPP, shares 2,180,000pcg_StockIssuedDuringPeriodForStockOptionsExercisedAndUnderDRSPPProgram
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= pcg_FourZeroOneKPlanDRSPPSharedBasedCompensationPlansMember
Stock Issued During Period Value Stock Options Exercised $ 77us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= pcg_FourZeroOneKPlanDRSPPSharedBasedCompensationPlansMember