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Inventories
9 Months Ended
Sep. 30, 2024
Inventory Disclosure [Abstract]  
Inventories Inventories
(Millions of dollars)September 30,
2024
December 31,
2023
Crude oil $3,449 $3,211 
Refined products5,240 4,940 
Materials and supplies1,197 1,166 
Total$9,886 $9,317 
Inventories are carried at the lower of cost or market value. Costs of crude oil and refined products are aggregated on a consolidated basis for purposes of assessing whether the LIFO cost basis of these inventories may have to be written down to market values.