Benefit Plans and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2024

Retirement Benefits [Abstract]

Components of Net Periodic Benefit Cost (Credit)

Components of Net Periodic Benefit Cost

	Three Months Ended March 31
	2024		2023
(Millions of Dollars)	Pension Benefits
Service cost	$	2	$	2
Interest cost (a)	5		6
Expected return on plan assets (a)	(8)		(8)
Amortization of net loss (a)	1		—
Net periodic benefit (credit) cost	$	—	$	—
Effects of regulation	1		1
Net benefit cost recognized for financial reporting	$	1	$	1

(a)The components of net periodic cost other than the service cost component are included in the line item “Other expense, net” in the statements of income or capitalized on the balance sheets as a regulatory asset.