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Financial Instruments and Risk Management (Tables)
 12 Months Ended
Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments
The carrying amount and fair value of our total debt is as follows:

December 31, 2024December 31, 2023
Millions of dollarsLevel 1Level 2Total fair valueCarrying valueLevel 1Level 2Total fair valueCarrying value
Total debt$4,503 $2,825 $7,328 $7,541 $7,419 $378 $7,797 $7,636