SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - (Government Assistance) (Details) - USD ($)			3 Months Ended
	Jan. 11, 2024	Oct. 18, 2022	Mar. 31, 2026	Mar. 31, 2025
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			$ 10,000,000	$ 40,000,000
Maximum disbursement	$ 1,100,000,000
Civil Nuclear Credit Program | Utilities Operating Expense, Maintenance and Operations
Public Utility, Property, Plant and Equipment [Line Items]
Reimbursement amount			$ 0	$ 41,000,000
Senate Bill 846 | Utility
Public Utility, Property, Plant and Equipment [Line Items]
Debt instrument, face amount		1,100,000,000
Maximum | Senate Bill 846 | Utility
Public Utility, Property, Plant and Equipment [Line Items]
Debt instrument, face amount		$ 1,400,000,000