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OTHER CONTINGENCIES AND COMMITMENTS (Environmental Remediation Contingencies Liability) (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Site Contingency [Line Items] |  |
Former manufactured gas plant sites owned by the Utility or third parties | $ 686 | $ 659
Utility-owned generation facilities (other than fossil fuel-fired), other facilities, and third-party disposal sites | 112 | 111
Fossil fuel-fired generation facilities and sites | 74 | 96
Environmental Remediation Liability | 1,300 | 1,301
Topock, Arizona |  |
Site Contingency [Line Items] |  |
Natural gas compressor station | 299 | 303
Hinkley, California |  |
Site Contingency [Line Items] |  |
Natural gas compressor station | $ 129 | $ 132

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- Definition Utility records an environmental remediation liability when site assessments indicate that remediation is probable and the Utility can reasonably estimate the loss or a range of probable amounts. The Utility records an environmental remediation liability based on the lower end of the range of estimated probable costs, unless an amount within the range is a better estimate than any other amount + References No definition available. + Details
Name: | pcg_EnvironmentalRemediationLiability
Namespace Prefix: | pcg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Former Mgp Sites Owned By Utility Or Third Parties + References No definition available. + Details
Name: | pcg_FormerManufacturedGasPlantSitesOwnedByUtilityOrThirdParties
Namespace Prefix: | pcg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Fossil Fuel-Fired Generation Facilities Formerly Owned By Utility + References No definition available. + Details
Name: | pcg_FossilFuelFiredGenerationFacilitiesFormerlyOwnedByUtility
Namespace Prefix: | pcg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Natural Gas Compressor Station + References No definition available. + Details
Name: | pcg_NaturalGasCompressorStation
Namespace Prefix: | pcg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Utility-Owned Generation Facilities (Other Than For Fossil Fuel-Fired), Other Facilities, And Third-Party Disposal Sites + References No definition available. + Details
Name: | pcg_UtilityOwnedGenerationFacilitiesOtherThanForFossilFuelFiredOtherFacilitiesAndThirdPartyDisposalSites
Namespace Prefix: | pcg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SiteContingencyLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_StatementGeographicalAxis=pcg_TopockArizonaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=pcg_HinkleyCaliforniaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |