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Inventories (Tables)
3 Months Ended
Mar. 31, 2024
Inventory Disclosure [Abstract]  
Schedule of Inventories
Millions of Dollars
March 31
2024
December 31
2023
Crude oil and natural gas
$723 676 
Materials and supplies
720 722 
Total inventories
$1,443 1,398 
Inventories valued on the LIFO basis
$437 401