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Segment Reporting (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Segment Reporting [Abstract]                  
Revenues $ 952     $ 929     $ 2,687 $ 2,616  
Purchased power and fuel 372     380     1,034 1,060  
Generation, transmission and distribution 112     131     336 337  
Administrative and other 99     102     291 294  
Operating Expenses 211     233     627 631  
Depreciation and amortization 148     126     427 369  
Taxes other than income taxes 47     44     139 132  
Costs and Expenses 778     783     2,227 2,192  
Operating Income (Loss) 174     146     460 424  
Interest Expense, Debt 62     57     182 168  
Allowance for Funds Used During Construction, Capitalized Interest (2)     (4)     (9) (12)  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 123     105     319 306  
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 103 $ 62 $ 100 $ 94 $ 72 $ 109 265 275  
Assets $ 13,014           13,014   $ 12,544
Payments to Acquire Property, Plant, and Equipment             $ 899 $ 876