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Commitments and Contingencies, Fuel Contracts (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Energy Payments      
Fuel Contracts [Abstract]      
2026 [1] $ 44    
2027 [1] 46    
2028 [1] 45    
2029 [1] 43    
2030 [1] 42    
Thereafter [1] 411    
Total [1] 631    
Utilities Operating Expense, Purchased Power under Long-term Contracts 34 $ 25 $ 29
Capacity      
Fuel Contracts [Abstract]      
2026 16    
2027 17    
2028 18    
2029 19    
2030 20    
Thereafter 204    
Total 294    
Utilities Operating Expense, Purchased Power under Long-term Contracts 16 $ 14 $ 12
Coal      
Fuel Contracts [Abstract]      
2026 75    
2027 62    
2028 0    
2029 0    
2030 0    
Thereafter 0    
Total 137    
Natural Gas Supply [Member]      
Fuel Contracts [Abstract]      
2026 26    
2027 0    
2028 0    
2029 0    
2030 0    
Thereafter 0    
Total 26    
Natural Gas Storage and Transportation [Member]      
Fuel Contracts [Abstract]      
2026 67    
2027 66    
2028 57    
2029 36    
2030 11    
Thereafter 40    
Total $ 277    
[1] Excludes contingent energy payments for renewable energy PPAs.