v3.26.1
Segment Information - Schedule of Segment Reporting Information, by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting [Abstract]            
Revenues $ 814   $ 807   $ 1,693 $ 1,735
Operating expenses:            
Purchased power and fuel 296   294   657 662
Operating and maintenance expense:            
Generation, transmission and distribution 112   114   222 224
Administrative and other 90   96   196 192
Total operating and maintenance expense 202   210   418 416
Depreciation and amortization 143   139   287 279
Taxes other than income taxes 52   46   103 92
Total operating expenses 693   689   1,465 1,449
Income from operations 121   118   228 286
Interest expense, net:            
Interest expense 64   60   126 120
Allowance for borrowed funds used during construction (3)   (3)   (5) (7)
Total interest expense, net 61   57   121 113
Other income, net:            
Other income, net 20   13   27 23
Income before income tax expense 80   74   134 196
Income tax expense 12   12   21 34
Net income $ 68 $ 45 $ 62 $ 100 $ 113 $ 162