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Inventories (Tables)
3 Months Ended
Mar. 31, 2023
Inventory Disclosure [Abstract]  
Schedule of Inventories
Millions of Dollars
March 31
2023
December 31
2022
Crude oil and natural gas
$666 641 
Materials and supplies
592 578 
Total Inventories
$1,258 1,219 
Inventories valued on the LIFO basis
$445 396