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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) $ in Millions | 6 Months Ended
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Jun. 30, 2018 USD ($)
Statement of Cash Flows [Abstract] |
Discount on net issuances of commercial paper | $ 1

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

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- References No definition available. + Details
Name: | us-gaap_StatementOfCashFlowsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration