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Revenue Recogniton Revenue Recognition Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]      
Document Period End Date Dec. 31, 2021    
Regulated Operating Revenue, Electric, Non-Nuclear $ 2,105 $ 1,910 $ 1,857
Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Estimate of Transaction Price (29) (6) 2
Deferred Revenue, Revenue Recognized 2 28 22
Regulated Operating Revenue 2,078 1,932 1,881
Unregulated Operating Revenue 255 162 170
Regulated and Unregulated Operating Revenue 63 51 72
Total Revenues 2,396 2,145 2,123
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount   24 23
Gain on Derivative Instruments, Pretax 63 65 50
Asset Retirement Obligation, Cash Paid to Settle 18 18 9
Residential [Member]      
Disaggregation of Revenue [Line Items]      
Regulated Operating Revenue, Electric, Non-Nuclear 1,118 1,030 981
Commercial [Member]      
Disaggregation of Revenue [Line Items]      
Regulated Operating Revenue, Electric, Non-Nuclear 690 616 636
Industrial [Member]      
Disaggregation of Revenue [Line Items]      
Regulated Operating Revenue, Electric, Non-Nuclear 250 218 196
Direct Access customers [Member]      
Disaggregation of Revenue [Line Items]      
Regulated Operating Revenue, Electric, Non-Nuclear $ 47 $ 46 $ 44