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Related Party Transactions (Tables)
 6 Months Ended
Jun. 30, 2022
Related Party Transactions [Abstract]  
Schedule of Significant Transactions with Related Parties

Millions of Dollars

Three Months Ended
June 30
Six Months Ended
June 30
Significant Transactions with Equity Affiliates
2022202120222021
Operating revenues and other income
$21 24 43 40 
Purchases
— 3 — 3 
Operating expenses and selling, general and administrative expenses
44 63 90 89 
Net interest (income) expense*
$— — (1)(1)
*We paid interest to, or received interest from, various affiliates. See Note 4 for information related to loans to equity affiliates.