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