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Benefit Plans and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2024
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost (Credit)
Components of Net Periodic Benefit Cost
Three Months Ended June 30
2024202320242023
(Millions of Dollars)Pension BenefitsPostretirement Health
Care Benefits
Service cost$2 $2 $— $— 
Interest cost (a)
6 6 1 — 
Expected return on plan assets (a)
(8)(8)(1)— 
Net periodic benefit (credit) cost— — — — 
Effects of regulation(2)1 — — 
Net benefit (credit) cost recognized for financial reporting$(2)$1 $— $— 
Six Months Ended June 30
2024202320242023
(Millions of Dollars)Pension BenefitsPostretirement Health
Care Benefits
Service cost$4 $3 $— $— 
Interest cost (a)
11 12 1 1 
Expected return on plan assets (a)
(16)(16)(1)(1)
Amortization of net loss (a)
1 1 — — 
Net periodic benefit cost — — — — 
Effects of regulation(1)2 — — 
Net benefit (credit) cost recognized for financial reporting$(1)$2 $— $— 
(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.