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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2021
Related Party Transactions [Abstract]  
Significant Transactions with Related Parties
Significant transactions with our equity
 
affiliates were:
 
Millions of Dollars
2021
2020
2019
Operating revenues and other income
$
88
79
89
Purchases
5
-
38
Operating expenses and selling, general
 
and administrative expenses
196
63
65
Net interest income*
(2)
(5)
(13)
*We paid interest to, or received interest from, various affiliates.
 
See Note 4, for additional information on loans to
 
affiliated companies.