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Condensed Consolidated Statements Of Cash Flows (Parenthetical) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Discount on net issuances of commercial paper $ 0pcg_NetIssuanceRepaymentsOfCommercialPaperDiscount $ 1pcg_NetIssuanceRepaymentsOfCommercialPaperDiscount
Premium, discount, and issuance costs on proceeds from long-term debt 0pcg_ProceedsFromIssuanceOfLongTermDebtDiscountAndIssuanceCosts 13pcg_ProceedsFromIssuanceOfLongTermDebtDiscountAndIssuanceCosts
Pacific Gas And Electric Company [Member]    
Discount on net issuances of commercial paper 0pcg_NetIssuanceRepaymentsOfCommercialPaperDiscount
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryOfCommonParentMember		 1pcg_NetIssuanceRepaymentsOfCommercialPaperDiscount
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryOfCommonParentMember
Premium, discount, and issuance costs on proceeds from long-term debt $ 0pcg_ProceedsFromIssuanceOfLongTermDebtDiscountAndIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryOfCommonParentMember		 $ 10pcg_ProceedsFromIssuanceOfLongTermDebtDiscountAndIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryOfCommonParentMember