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Fair value by balance sheet grouping table (Tables)
 3 Months Ended
Mar. 31, 2022
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, including short-term borrowings and current maturities of long-term debt, is as follows:
March 31, 2022December 31, 2021
Millions of dollarsLevel 1Level 2Total fair valueCarrying valueLevel 1Level 2Total fair valueCarrying value
Total debt$9,372 $126 $9,498 $8,534 $10,518 $527 $11,045 $9,138