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WILDFIRE-RELATED CONTINGENCIES (Insurance Receivable) (Details) - USD ($) $ in Millions |  | 3 Months Ended
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Apr. 20, 2022 | Mar. 31, 2022
Insurance Receivable [Roll Forward] |  |
Insurance Receivable, Beginning Balance |  | $ 1,247
Accrued insurance recoveries |  | 0
Reimbursements |  | 43
Insurance Receivable, Ending Balance |  | 1,204
2021 Dixie fire |  |
Insurance Receivable [Roll Forward] |  |
Insurance Receivable, Beginning Balance |  | 563
Accrued insurance recoveries |  | (1)
Reimbursements |  | 0
Insurance Receivable, Ending Balance |  | 562
Insurance receivable |  | 562
2020 Zogg fire |  |
Insurance Receivable [Roll Forward] |  |
Insurance Receivable, Beginning Balance |  | 270
Accrued insurance recoveries |  | 1
Reimbursements |  | 43
Insurance Receivable, Ending Balance |  | 228
Insurance receivable |  | 338
2020 Zogg fire | Subsequent Event |  |
Insurance Receivable [Roll Forward] |  |
Reimbursements | $ 28 |
2019 Kincade fire |  |
Insurance Receivable [Roll Forward] |  |
Insurance Receivable, Beginning Balance |  | 414
Accrued insurance recoveries |  | 0
Reimbursements |  | 0
Insurance Receivable, Ending Balance |  | 414
Insurance receivable |  | $ 430

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- Definition Insurance Receivable [Roll Forward] + References No definition available. + Details
Name: | pcg_InsuranceReceivableRollForward
Namespace Prefix: | pcg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Insurance Settlements Receivable, Reimbursements + References No definition available. + Details
Name: | pcg_InsuranceSettlementsReceivableReimbursements
Namespace Prefix: | pcg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Liability Insurance Coverage, Insurance Receivable + References No definition available. + Details
Name: | pcg_LiabilityInsuranceCoverageInsuranceReceivable
Namespace Prefix: | pcg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
Name: | us-gaap_InsuranceRecoveries
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy. + References No definition available. + Details
Name: | us-gaap_InsuranceSettlementsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=pcg_DixieFire2021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=pcg_ZoggFire2020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=pcg_KincadeFire2019Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |