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Inventories (Tables)
12 Months Ended
Dec. 31, 2023
Inventory Disclosure [Abstract]  
Schedule of Inventories
Inventories at December 31 were:
Millions of Dollars
20232022
Crude oil and natural gas$676 641 
Materials and supplies722 578 
Total inventories$1,398 1,219 
Inventories valued on the LIFO basis$401 396