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Fair Value of Financial Assets and Liabilities (Tables)
6 Months Ended
Jun. 30, 2024
Fair Value Disclosures [Abstract]  
Carrying Amount and Fair Value of Long-term Debt
June 30, 2024Dec. 31, 2023
(Millions of Dollars)Carrying AmountFair ValueCarrying AmountFair Value
Long-term debt, including current portion$1,405 $1,306 $1,211 $1,117