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Benefit Plans and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2022
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost (Credit)
Components of Net Periodic Benefit Cost
Three Months Ended June 30
2022202120222021
(Millions of Dollars)Pension BenefitsPostretirement Health
Care Benefits
Service cost$7 $8 $— $— 
Interest cost (a)
6 6 — — 
Expected return on plan assets (a)
(12)(13)— — 
Amortization of prior service credit (a)
— — — (1)
Amortization of net loss (a)
6 8 — 1 
Net periodic benefit cost7 9 — — 
Effects of regulation— (1)— — 
Net benefit cost recognized for financial reporting$7 $8 $— $— 
Six Months Ended June 30
2022202120222021
(Millions of Dollars)Pension BenefitsPostretirement Health
Care Benefits
Service cost$14 $15 $— $— 
Interest cost (a)
12 12 1 1 
Expected return on plan assets (a)
(24)(26)— — 
Amortization of prior service credit (a)
— — (1)(2)
Amortization of net loss (a)
12 17 — 1 
Settlement charge (b)
(1)— — — 
Net periodic benefit cost13 18 — — 
Effects of regulation1 (2)— — 
Net benefit cost recognized for financial reporting$14 $16 $— $— 
(a)     The components of net periodic cost other than the service cost component are included in the line item “Other income, net” in the consolidated statements of income or capitalized on the consolidated balance sheets as a regulatory asset.
(b)     In the first quarter of 2022, NSP-Minnesota recognized $1 million in settlement charge true-ups related to fourth quarter 2021.
 [1]
[1] The components of net periodic cost other than the service cost component are included in the line item “Other income, net” in the consolidated statements of income or capitalized on the consolidated balance sheets as a regulatory asset.