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WILDFIRE-RELATED CONTINGENCIES (Summary of Insurance Receivables) (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Insurance Receivable [Roll Forward] |  |
Reimbursements | $ 35 | $ (144)
2018 Camp fire |  |
Insurance Receivable [Roll Forward] |  |
Insurance Receivable, Beginning Balance | 1,380 |
Accrued insurance recoveries | 0 |
Reimbursements | 0 |
Insurance Receivable, Ending Balance | 1,380 |
2017 Northern California wildfires |  |
Insurance Receivable [Roll Forward] |  |
Insurance Receivable, Beginning Balance | 829 |
Accrued insurance recoveries | 0 |
Reimbursements | 0 |
Insurance Receivable, Ending Balance | $ 829 |

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- Definition Probable insurance recoveries recorded by the Utility in connection with losses related to the Butte fire. + References No definition available. + Details
Name: | pcg_AccruedInsuranceRecoveries
Namespace Prefix: | pcg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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 The increase (decrease) during the reporting period in insurance settlements receivable, which are amounts due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy. The expectation is that such reimbursement will be received within one year of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInInsuranceSettlementsReceivable
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_A2018CampFireMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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