v3.26.3
Benefit Plans and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2026
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
Components of Net Periodic Benefit Cost
Three Months Ended Sept. 30
20262025
(Millions of Dollars)Pension Benefits
Service cost$1 $1 
Interest cost (a)
1 2 
Expected return on plan assets (a)
(2)(2)
Amortization of net loss (a)
1 1 
Net periodic benefit cost1 2 
Effects of regulation1 — 
Net benefit cost recognized for financial reporting$2 $2 
Nine Months Ended Sept. 30
20262025
(Millions of Dollars)Pension Benefits
Service cost$3 $3 
Interest cost (a)
4 4 
Expected return on plan assets (a)
(6)(6)
Amortization of net loss (a)
2 1 
Net periodic benefit cost3 2 
Effects of regulation2 1 
Net benefit cost recognized for financial reporting$5 $3 
(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.