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DERIVATIVES (Additional Cash Collateral The Utility Would Be Required To Post If Its Credit Risk-Related Contingency Features Were Triggered) (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Derivatives in a liability position with credit risk-related contingencies that are not fully collateralized | $ (1) | $ (1)
Related derivatives in an asset position | 0 | 0
Collateral posting in the normal course of business related to these derivatives | 0 | 0
Net position of derivative contracts/additional collateral posting requirements | $ (1) | $ (1)

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- Definition Collateral Posting In The Normal Course Of Business Related To Derivatives + References No definition available. + Details
Name: | pcg_CollateralPostingInNormalCourseOfBusinessRelatedToDerivatives
Namespace Prefix: | pcg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Derivative asset positions with counterparties for which derivative liability positions are not fully collateralized with cash. + References No definition available. + Details
Name: | pcg_DerivativesCreditRiskRelatedContingenciesAssetPosition
Namespace Prefix: | pcg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Derivative liability positions with counterparties for which the derivative liability is not fully collateralized with cash. + References No definition available. + Details
Name: | pcg_DerivativesCreditRiskRelatedContingenciesLiabilityPosition
Namespace Prefix: | pcg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624258-113959 + Details
Name: | us-gaap_AdditionalCollateralAggregateFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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