v3.26.1
Inventories
3 Months Ended
Mar. 31, 2026
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories consisted of the following:

 Millions of Dollars
 March 31
2026
December 31
2025
Crude oil and products$6,141 4,529 
Materials and supplies582 568 
$6,723 5,097 


Inventories valued on the last-in, first-out (LIFO) basis totaled $6,078 million and $4,461 million at March 31, 2026, and December 31, 2025, respectively. The estimated excess of current replacement cost over LIFO cost of inventories amounted to approximately $10.5 billion and $3.6 billion at March 31, 2026, and December 31, 2025, respectively.

Certain planned reductions in inventory that are not expected to be replaced by the end of the year cause liquidations of LIFO inventory values. LIFO liquidations did not have a material impact on net income for the three months ended March 31, 2026 and 2025.