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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Discount on net issuances of commercial paper | $ 0 | $ 2
Premium, discount, and issuance costs on proceeds from long-term debt | 0 | 10
Pacific Gas & Electric Co |  |
Discount on net issuances of commercial paper | 0 | 2
Premium, discount, and issuance costs on proceeds from long-term debt | $ 0 | $ 10

X
- Definition Discount on net commercial paper issuances. + References No definition available. + Details
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Namespace Prefix: | pcg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow from borrowings payable greater than 12 months, net of premium, discount and cash paid to third parties in connection with debt origination + References No definition available. + Details
Name: | pcg_ProceedsFromIssuanceOfLongTermDebtDiscountAndIssuanceCosts
Namespace Prefix: | pcg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=pcg_PacificGasElectricCoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |