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Inventories
6 Months Ended
Jun. 30, 2025
Inventory Disclosure [Abstract]  
Inventories Inventories
(Millions of dollars)June 30,
2025
December 31,
2024
Crude oil and other feedstocks$3,548 $3,185 
Refined products5,276 5,137 
Materials and supplies1,282 1,246 
Total$10,106 $9,568 
Inventories are carried at the lower of cost or market value. Costs of crude oil and other feedstocks 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.