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REGULATORY ASSETS, LIABILITIES, AND BALANCING ACCOUNTS (Current Regulatory Balancing Accounts, Net) (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Total regulatory balancing accounts payable |  |
Regulatory Assets [Line Items] |  |
Total regulatory balancing accounts, net | $ 1,139 | $ 1,245
Total regulatory balancing accounts payable | Electric distribution |  |
Regulatory Assets [Line Items] |  |
Total regulatory balancing accounts, net | 330 | 55
Total regulatory balancing accounts payable | Electric transmission |  |
Regulatory Assets [Line Items] |  |
Total regulatory balancing accounts, net | 100 | 267
Total regulatory balancing accounts payable | Gas distribution and transmission |  |
Regulatory Assets [Line Items] |  |
Total regulatory balancing accounts, net | 53 | 76
Total regulatory balancing accounts payable | Energy procurement |  |
Regulatory Assets [Line Items] |  |
Total regulatory balancing accounts, net | 133 | 158
Total regulatory balancing accounts payable | Public purpose programs |  |
Regulatory Assets [Line Items] |  |
Total regulatory balancing accounts, net | 300 | 410
Total regulatory balancing accounts payable | Other |  |
Regulatory Assets [Line Items] |  |
Total regulatory balancing accounts, net | 223 | 279
Total regulatory balancing accounts receivable |  |
Regulatory Assets [Line Items] |  |
Total regulatory balancing accounts, net | 2,905 | 2,001
Total regulatory balancing accounts receivable | Gas distribution and transmission |  |
Regulatory Assets [Line Items] |  |
Total regulatory balancing accounts, net | 225 | 102
Total regulatory balancing accounts receivable | Energy procurement |  |
Regulatory Assets [Line Items] |  |
Total regulatory balancing accounts, net | 225 | 413
Total regulatory balancing accounts receivable | Public purpose programs |  |
Regulatory Assets [Line Items] |  |
Total regulatory balancing accounts, net | 278 | 292
Total regulatory balancing accounts receivable | Fire hazard prevention memorandum account |  |
Regulatory Assets [Line Items] |  |
Total regulatory balancing accounts, net | 81 | 121
Total regulatory balancing accounts receivable | Fire risk mitigation memorandum account |  |
Regulatory Assets [Line Items] |  |
Total regulatory balancing accounts, net | 22 | 33
Total regulatory balancing accounts receivable | Wildfire mitigation plan memorandum account |  |
Regulatory Assets [Line Items] |  |
Total regulatory balancing accounts, net | 108 | 161
Total regulatory balancing accounts receivable | Wildfire mitigation balancing account |  |
Regulatory Assets [Line Items] |  |
Total regulatory balancing accounts, net | 41 | 27
Total regulatory balancing accounts receivable | General rate case memorandum accounts |  |
Regulatory Assets [Line Items] |  |
Total regulatory balancing accounts, net | 467 | 313
Total regulatory balancing accounts receivable | Vegetation management balancing account |  |
Regulatory Assets [Line Items] |  |
Total regulatory balancing accounts, net | 277 | 115
Total regulatory balancing accounts receivable | Insurance premium costs |  |
Regulatory Assets [Line Items] |  |
Total regulatory balancing accounts, net | 508 | 135
Total regulatory balancing accounts receivable | Other |  |
Regulatory Assets [Line Items] |  |
Total regulatory balancing accounts, net | $ 673 | $ 289

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- Definition The Utility's current regulatory balancing accounts represent the amounts expected to be received from or refunded to the Utility's customers through authorized rate adjustments within the next 12 months. + References No definition available. + Details
Name: | pcg_TotalCurrentRegulatoryBalancingAccounts
Namespace Prefix: | pcg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_RegulatoryAssetLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | pcg_RegulatoryBalancingAccountsAxis=pcg_DistributionRevenueAdjustmentMechanismMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | pcg_RegulatoryBalancingAccountsAxis=us-gaap_ElectricTransmissionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | pcg_RegulatoryBalancingAccountsAxis=pcg_GasFixedCostMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | pcg_RegulatoryBalancingAccountsAxis=pcg_EnergyProcurementCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | pcg_RegulatoryBalancingAccountsAxis=pcg_PublicPurposeProgramsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | pcg_RegulatoryBalancingAccountsAxis=pcg_OtherCurrentBalancingAccountsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RegulatoryAssetAxis=pcg_RegulatoryBalancingAccountsReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | pcg_RegulatoryBalancingAccountsAxis=pcg_FireHazardPreventionMemorandumAccountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | pcg_RegulatoryBalancingAccountsAxis=pcg_FireRiskMitigationMemorandumAccountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | pcg_RegulatoryBalancingAccountsAxis=pcg_WildFireMitigationPlanMemorandumAccountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | pcg_RegulatoryBalancingAccountsAxis=pcg_WildfireMitigationBalancingAccountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | pcg_RegulatoryBalancingAccountsAxis=pcg_GeneralRateCaseMemorandumAccountsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | pcg_RegulatoryBalancingAccountsAxis=pcg_VegetationManagementBalancingAccountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | pcg_RegulatoryBalancingAccountsAxis=pcg_InsurancePremiumCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |