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Inventories (Tables)
9 Months Ended
Sep. 30, 2022
Inventory Disclosure [Abstract]  
Schedule of Inventories
Millions of Dollars
September 30
2022
December 31 2021
Crude oil and natural gas
$650 647 
Materials and supplies
576 561 
Total Inventories
$1,226 1,208 
Inventories valued on the LIFO basis
$389 395