v3.26.1
Segment Reporting (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting [Line Items]        
Electric fuel and purchased power $ 18 $ 158 $ 216 $ 374
Operating and maintenance expenses 85 83 171 171
Utilities Operating Expense, Depreciation and Amortization 125 115 244 227
Other income, net 3 3 3 4
Interest and Debt Expense 44 45 90 88
Income tax benefit (24) (16) (44) (37)
Net income $ 123 101 $ 207 160
Number Of Reportable Segments, Disclosed By Definition, Flag true   true  
Total revenues | Regulated Electric Segment        
Segment Reporting [Line Items]        
Regulated Operating Revenue, Electric $ 389 508 $ 919 1,029
Electric fuel and purchased power 18 158 216 374
Operating and maintenance expenses 85 83 171 171
Utilities Operating Expense, Depreciation and Amortization 125 115 244 227
Other income, net 18 22 35 46
Interest and Debt Expense 44 45 90 88
Income tax benefit (24) (16) (44) (37)
Net income $ 123 $ 101 $ 207 $ 160