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Fair Value of Financial Assets and Liabilities (Tables)
 12 Months Ended
Dec. 31, 2024
Fair Value Disclosures [Abstract]  
Carrying Amount and Fair Value of Long-term Debt
As of Dec. 31, other financial instruments for which the carrying amount did not equal fair value:
20242023
(Millions of Dollars)Carrying AmountFair ValueCarrying AmountFair Value
Long-term debt, including current portion$1,406 $1,299 $1,211 $1,117