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Revenue Recognition (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Disaggregation of Revenue [Line Items]        
Subtotal $ 639 $ 569 $ 1,389 $ 1,216
Alternative revenue programs, net of amortization (3) 2 (14) 5
Other Cost of Operating Revenue 4      
Other accrued (deferred) revenues, net   (4) (5) (3)
Total retail revenues 640 567 1,380 1,218
Wholesale revenues 99 62 275 150
Other operating revenue 19 19 32 28
Total revenues 758 648 1,687 1,396
Gain on Derivative Instruments, Pretax 32 22 120 56
Residential [Member]        
Disaggregation of Revenue [Line Items]        
Subtotal 307 279 722 641
Commercial [Member]        
Disaggregation of Revenue [Line Items]        
Subtotal 219 196 446 393
Industrial [Member]        
Disaggregation of Revenue [Line Items]        
Subtotal 104 87 206 169
Direct Access customers [Member]        
Disaggregation of Revenue [Line Items]        
Subtotal $ 9 $ 7 $ 15 $ 13