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Inventories (Tables)
9 Months Ended
Sep. 30, 2024
Inventory Disclosure [Abstract]  
Schedule of Inventories
Millions of Dollars
September 30
2024
December 31
2023
Crude oil and natural gas
$759 676 
Materials and supplies
737 722 
Total inventories
$1,496 1,398 
Inventories valued on the LIFO basis
$424 401