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Related Party Transactions (Tables)
9 Months Ended
Sep. 30, 2023
Related Party Transactions [Abstract]  
Schedule of Significant Transactions with Related Parties

Millions of Dollars

Three Months Ended
September 30
Nine Months Ended
September 30
2023202220232022
Significant Transactions with Equity Affiliates
Operating revenues and other income
$23 21 67 64 
Purchases
 —  
Operating expenses and selling, general and administrative expenses
73 55 224 145 
Net interest income
 —  (1)