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CONTINGENCIES AND COMMITMENTS (Disallowance of Plant Costs) (Details) - Disallowance of Plant Costs $ in Millions | Jun. 23, 2016 USD ($)
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Loss Contingencies [Line Items] |
Gas transmission and storage capital disallowance | $ 696
Permanently disallowed capital | 120
Amount subject to audit | $ 576

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- Definition Amount Subject To Audit + References No definition available. + Details
Name: | pcg_AmountSubjectToAudit
Namespace Prefix: | pcg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Capital disallowance in relation to GT&S cases + References No definition available. + Details
Name: | pcg_GasTransmissionAndStorageCapitalDisallowance
Namespace Prefix: | pcg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Permanently Disallowed Capital + References No definition available. + Details
Name: | pcg_PermanentlyDisallowedCapital
Namespace Prefix: | pcg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=pcg_DisallowanceOfPlantCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |