Benefit Plans and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2022

Retirement Benefits [Abstract]

Components of Net Periodic Benefit Cost (Credit)

Components of Net Periodic Benefit Cost (Credit)

	Three Months Ended Sept. 30
	2022		2021		2022		2021
(Millions of Dollars)	Pension Benefits				Postretirement Health Care Benefits
Service cost	$	2	$	3	$	—	$	—
Interest cost (a)	4		3		—		—
Expected return on plan assets (a)	(8)		(7)		—		—
Amortization of net loss (gain) (a)	3		4		(1)		—
Settlement charge (b)	2		—		—		—
Net periodic benefit cost	$	3	$	3	$	(1)	$	—
Effects of regulation	(1)		(1)		—		—
Net benefit cost recognized for financial reporting	$	2	$	2	$	(1)	$	—

	Nine Months Ended Sept. 30
	2022		2021		2022		2021
(Millions of Dollars)	Pension Benefits				Postretirement Health Care Benefits
Service cost	$	7	$	8	$	—	$	—
Interest cost (a)	12		11		1		—
Expected return on plan assets (a)	(23)		(22)		(1)		(1)
Amortization of net loss (gain) (a)	8		11		(1)		—
Settlement charge (b)	2		—		—		—
Net periodic benefit cost	$	6	$	8	$	(1)	$	(1)
Effects of regulation	(1)		—		—		—
Net benefit cost recognized for financial reporting	$	5	$	8	$	(1)	$	(1)

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

(b)A settlement charge is required when the amount of all lump-sum distributions during the year is greater than the sum of the service and interest cost components of the annual net periodic pension cost. In the third quarter as a result of lump-sum distributions during the 2022 plan year, SPS recorded a pension settlement charge of $2 million, the majority of which was not recognized in earnings due to the effects of regulation.