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Inventories (Tables)
3 Months Ended
Mar. 31, 2023
Inventory Disclosure [Abstract]  
Schedule of Inventories
Inventories consisted of the following:

 Millions of Dollars
 March 31
2023
December 31
2022
Crude oil and petroleum products$5,046 2,914 
Materials and supplies399 362 
$5,445 3,276