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REGULATORY ASSETS, LIABILITIES, AND BALANCING ACCOUNTS (Current Regulatory Balancing Accounts, Net) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Total regulatory balancing accounts receivable |  |
Regulatory Assets [Line Items] |  |
Total regulatory balancing accounts, net | $ 1,884 | $ 1,435
Total regulatory balancing accounts receivable | Electric distribution |  |
Regulatory Assets [Line Items] |  |
Total regulatory balancing accounts, net | 465 | 160
Total regulatory balancing accounts receivable | Electric transmission |  |
Regulatory Assets [Line Items] |  |
Total regulatory balancing accounts, net | 91 | 128
Total regulatory balancing accounts receivable | Utility generation |  |
Regulatory Assets [Line Items] |  |
Total regulatory balancing accounts, net | 92 | 79
Total regulatory balancing accounts receivable | Gas distribution and transmission |  |
Regulatory Assets [Line Items] |  |
Total regulatory balancing accounts, net | 173 | 462
Total regulatory balancing accounts receivable | Energy procurement |  |
Regulatory Assets [Line Items] |  |
Total regulatory balancing accounts, net | 654 | 168
Total regulatory balancing accounts receivable | Public purpose programs |  |
Regulatory Assets [Line Items] |  |
Total regulatory balancing accounts, net | 97 | 111
Total regulatory balancing accounts receivable | Other |  |
Regulatory Assets [Line Items] |  |
Total regulatory balancing accounts, net | 312 | 327
Total regulatory balancing accounts payable |  |
Regulatory Assets [Line Items] |  |
Total regulatory balancing accounts, net | 1,370 | 1,076
Total regulatory balancing accounts payable | Electric transmission |  |
Regulatory Assets [Line Items] |  |
Total regulatory balancing accounts, net | 135 | 134
Total regulatory balancing accounts payable | Gas distribution and transmission |  |
Regulatory Assets [Line Items] |  |
Total regulatory balancing accounts, net | 6 | 9
Total regulatory balancing accounts payable | Energy procurement |  |
Regulatory Assets [Line Items] |  |
Total regulatory balancing accounts, net | 308 | 59
Total regulatory balancing accounts payable | Public purpose programs |  |
Regulatory Assets [Line Items] |  |
Total regulatory balancing accounts, net | 610 | 587
Total regulatory balancing accounts payable | Other |  |
Regulatory Assets [Line Items] |  |
Total regulatory balancing accounts, net | $ 311 | $ 287

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