Segment Reporting (Tables)

12 Months Ended

Dec. 31, 2024

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

	2024		2023		2022
(Millions of Dollars)	Regulated electric utility		Regulated electric utility		Regulated electric utility
Operating revenues	$	1,939	$	2,152	$	2,426
Electric fuel and purchased power	588		910		1,157
O&M expenses	313		279		317
Depreciation and amortization	455		368		388
Other segment expenses, net (a)	93		120		127
Interest charges and financing costs	153		136		141
Income tax benefit	(57)		(45)		(53)
Net income	$	394	$	384	$	349

(a)Other segment expenses, net, for 2023 additionally includes workforce reduction expenses.