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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Government Assistance (Details) - USD ($) |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jan. 11, 2024 | Oct. 18, 2022 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Senate Bill 846 | Utility |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  | $ 1,100,000,000 |  |  |  |
Senate Bill 846 | Utility | Maximum |  |  |  |  |  |
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 |  |  |  |
Civil Nuclear Credit Program |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Disbursement |  |  |  | $ 159,000,000 |  | $ 299,000,000
Maximum disbursement | $ 1,100,000,000 |  |  |  |  |
Government Assistance, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  |  | Operating and maintenance |  | Operating and maintenance
Civil Nuclear Credit Program | Cost of Goods and Services Sold, Electricity |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Disbursement |  |  | $ 16,000,000 |  | $ 57,000,000 |
Government Assistance, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Cost of Product and Service Sold |  | Cost of Product and Service Sold |
Civil Nuclear Credit Program | Utilities Operating Expense, Maintenance and Operations |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Disbursement |  |  | $ 60,000,000 |  | $ 100,000,000 |
Government Assistance, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Operating and maintenance |  | Operating and maintenance |

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