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Inventories | 9 Months Ended
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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.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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