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Fair value by balance sheet grouping table (Tables)
 9 Months Ended
Sep. 30, 2024
Fair Value Disclosures [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:
September 30, 2024December 31, 2023
Millions of dollarsLevel 1Level 2Total fair valueCarrying valueLevel 1Level 2Total fair valueCarrying value
Total debt$7,711 $101 $7,812 $7,639 $7,419 $378 $7,797 $7,636