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Inventories
9 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Inventories INVENTORIES
(In millions)
September 30,
2019
 
December 31,
2018
Crude oil and refinery feedstocks
$
3,415

 
$
3,655

Refined products
5,152

 
5,234

Materials and supplies
907

 
720

Merchandise
222

 
228

Total
$
9,696

 
$
9,837


Inventories are carried at the lower of cost or market value. The cost of inventories of crude oil and refinery feedstocks, refined products and merchandise is determined primarily under the LIFO method. There were no LIFO inventory liquidations recognized for the nine months ended September 30, 2019.