v3.26.3
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - (Government Assistance) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Jan. 11, 2024
USD ($)
Oct. 18, 2022
USD ($)
$ / MWh
Sep. 30, 2026
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2026
USD ($)
Sep. 30, 2025
USD ($)
Aug. 24, 2026
USD ($)
Dec. 31, 2025
USD ($)
Performance-Based Disbursement                
Public Utility, Property, Plant and Equipment [Line Items]                
Monthly performance-based disbursements, per megawatt-hour | $ / MWh   7            
Maximum disbursement   $ 300            
Civil Nuclear Credit Program                
Public Utility, Property, Plant and Equipment [Line Items]                
Maximum disbursement $ 1,100              
Restricted cash, noncurrent     $ 272   $ 272     $ 0
Civil Nuclear Credit Program, Incurred Eligible Costs                
Public Utility, Property, Plant and Equipment [Line Items]                
Disbursement     $ 6 $ 34 $ 37 $ 134    
Government Assistance, Statement of Income or Comprehensive Income [Extensible Enumeration]     Operating and maintenance Operating and maintenance Operating and maintenance Operating and maintenance    
Civil Nuclear Credit Program, Incurred Fuel Costs                
Public Utility, Property, Plant and Equipment [Line Items]                
Disbursement           $ 57    
Government Assistance, Statement of Income or Comprehensive Income [Extensible Enumeration]           Cost of Product and Service Sold    
Utility | Civil Nuclear Credit Program                
Public Utility, Property, Plant and Equipment [Line Items]                
Government assistance, award amount             $ 272  
Restricted cash, noncurrent     $ 272   $ 272     $ 0
Senate Bill 846 | Utility                
Public Utility, Property, Plant and Equipment [Line Items]                
Debt instrument, face amount   1,100            
Maximum | Senate Bill 846 | Utility                
Public Utility, Property, Plant and Equipment [Line Items]                
Debt instrument, face amount   $ 1,400