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Inventories | 3 Months Ended
--- | ---
Mar. 31, 2018
Inventory Disclosure [Abstract] |
Inventories | Inventories
(In millions) | March 31, 2018 |  | December 31, 2017
Crude oil and refinery feedstocks | $ | 1,777 |  |  | $ | 2,056 |
Refined products | 2,746 |  |  | 2,839 |
Materials and supplies | 435 |  |  | 494 |
Merchandise | 153 |  |  | 161 |
Total | $ | 5,111 |  |  | $ | 5,550 |
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 material liquidations of LIFO inventories for the three months ended March 31, 2018.

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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