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Revenue Recognition (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]        
Subtotal $ 527 $ 479 $ 1,564 $ 1,407
Alternative revenue programs, net of amortization (12) (9) (23) 0
Other accrued (deferred) revenues, net   (7) (12) (13)
Total retail revenues 516 477 1,553 1,420
Wholesale revenues 112 56 186 130
Other operating revenue 14 14 49 39
Total revenues 642 547 1,788 1,589
Gain on Derivative Instruments, Pretax 37 31 46 55
Other Cost of Operating Revenue 1      
Residential [Member]        
Disaggregation of Revenue [Line Items]        
Subtotal 265 245 824 747
Commercial [Member]        
Disaggregation of Revenue [Line Items]        
Subtotal 186 164 518 463
Industrial [Member]        
Disaggregation of Revenue [Line Items]        
Subtotal 65 58 187 162
Direct Access customers [Member]        
Disaggregation of Revenue [Line Items]        
Subtotal $ 11 $ 12 $ 35 $ 35