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Segment Reporting (Tables)
 12 Months Ended
Dec. 31, 2025
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment
202520242023
(Millions of Dollars)Regulated electric utilityRegulated electric utilityRegulated electric utility
Operating revenues$2,180 $1,939 $2,152 
Electric fuel and purchased power756 588 910 
O&M expenses343 313 279 
Depreciation and amortization464 455 368 
Other segment expenses, net (a)
85 93 120 
Interest charges and financing costs177 153 136 
Income tax benefit(40)(57)(45)
Net income$395 $394 $384 
(a)Other segment expenses, net, for 2023 additionally includes workforce reduction expenses.