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Revenue Recogniton Revenue Recognition Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disaggregation of Revenue [Line Items]      
Document Period End Date Dec. 31, 2024    
Regulated Operating Revenue, Electric, Non-Nuclear $ 2,839 $ 2,439 $ 2,205
Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Estimate of Transaction Price (40) 11 11
Deferred Revenue, Revenue Recognized 16 3 7
Regulated Operating Revenue 2,815 2,447 2,223
Unregulated Operating Revenue 558 418 363
Regulated and Unregulated Operating Revenue 67 58 61
Total Revenues 3,440 2,923 2,647
Gain on Derivative Instruments, Pretax 273 185 133
Residential [Member]      
Disaggregation of Revenue [Line Items]      
Regulated Operating Revenue, Electric, Non-Nuclear 1,457 1,263 1,158
Commercial [Member]      
Disaggregation of Revenue [Line Items]      
Regulated Operating Revenue, Electric, Non-Nuclear 914 800 723
Industrial [Member]      
Disaggregation of Revenue [Line Items]      
Regulated Operating Revenue, Electric, Non-Nuclear 435 349 289
Direct Access customers [Member]      
Disaggregation of Revenue [Line Items]      
Regulated Operating Revenue, Electric, Non-Nuclear $ 33 $ 27 $ 35