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Inventories (Tables)
6 Months Ended
Jun. 30, 2022
Inventory Disclosure [Abstract]  
Schedule of Inventories
Millions of Dollars
June 30
2022
December 31 2021
Crude oil and natural gas
$653 647 
Materials and supplies
581 561 
Total Inventories
$1,234 1,208 
Inventories valued on the LIFO basis
$326 395