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Fair value by balance sheet grouping table (Tables)
 9 Months Ended
Sep. 30, 2021
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:
September 30, 2021December 31, 2020
Millions of dollarsLevel 1Level 2Total fair valueCarrying valueLevel 1Level 2Total fair valueCarrying value
Total debt$10,896 $147 $11,043 $9,136 $10,856 $700 $11,556 $9,827