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Common Stock And Share-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Feb. 11, 2014
Dec. 31, 2013
Common stock, shares outstanding 475,913,404us-gaap_CommonStockSharesOutstanding         456,670,424us-gaap_CommonStockSharesOutstanding
Equity distribution agreement amount         $ 500pcg_EquityDistributionAgreementAmount  
Dividend per share $ 0.455us-gaap_DividendsPayableAmountPerShare $ 0.455us-gaap_DividendsPayableAmountPerShare $ 0.455us-gaap_DividendsPayableAmountPerShare $ 0.455us-gaap_DividendsPayableAmountPerShare    
Debt covenant ratio of total consolidated debt to total consolidated capitalization percentage 65.00%pcg_DebtCovenantRatioOfTotalConsolidatedDebtToTotalConsolidatedCapitalizationPercentage          
Percentage of equity for capital structure to be maintained 52.00%pcg_PercentageOfEquityForCapitalStructureToBeMaintained          
Common stock 10,421us-gaap_CommonStockValue         9,550us-gaap_CommonStockValue
Equity Contract [Member]            
Common stock shares issued 11,000,000us-gaap_CommonStockSharesIssued
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquityContractMember
         
Common stock 496us-gaap_CommonStockValue
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquityContractMember
         
Four Zero One K Plan D R S P P Shared Based Compensation Plans [Member]            
Common stock shares issued 8,000,000us-gaap_CommonStockSharesIssued
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= pcg_FourZeroOneKPlanDRSPPSharedBasedCompensationPlansMember
         
Common stock 306us-gaap_CommonStockValue
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= pcg_FourZeroOneKPlanDRSPPSharedBasedCompensationPlansMember
         
May 2, 2013 Equity Contract [Member]            
Fees and Commissions 4us-gaap_FeesAndCommissions
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= pcg_MaySecondTwoThousandThirteenEquityContractMember
         
Utility [Member]            
Net restricted assets for equity component requirement 14,600us-gaap_OtherRestrictedAssets
/ dei_LegalEntityAxis
= pcg_UtilityMember
         
Additional Common Stock Dividends $ 153pcg_AdditionalCommonStockDividends
/ dei_LegalEntityAxis
= pcg_UtilityMember