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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Government Assistance (Details) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 11, 2024 | Oct. 18, 2022 | Dec. 31, 2023 | Dec. 31, 2022
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Government Assistance, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Total deduction to Operating Expenses |
Senate Bill 846 | Pacific Gas & Electric Co (Utility) |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Debt instrument, face amount |  | $ 1,100,000,000 |  |
Maximum | Senate Bill 846 | Pacific Gas & Electric Co (Utility) |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Debt instrument, face amount |  | 1,400,000,000 |  |
Performance-Based Disbursement |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Disbursement |  | 7 |  |
Maximum disbursement |  | $ 300,000,000 |  |
Performance-Based Disbursement | Cost of Goods and Services Sold, Electricity |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Reimbursement amount |  |  | $ 56,000,000 | $ 0
Civil Nuclear Credit Program | Subsequent Event |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Disbursement | $ 1,100,000,000 |  |  |
Civil Nuclear Credit Program | Cost of Goods and Services Sold, Electricity |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Reimbursement amount |  |  | 76,000,000 |
Civil Nuclear Credit Program | Utilities Operating Expense, Maintenance and Operations |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Reimbursement amount |  |  | $ 115,000,000 |

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