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Inventories | 3 Months Ended
--- | ---
Mar. 31, 2017
Inventory Disclosure [Abstract] |
Inventories | Inventories
(In millions) | March 31, 2017 |  | December 31, 2016
Crude oil and refinery feedstocks | $ | 2,148 |  |  | $ | 2,208 |
Refined products | 2,674 |  |  | 2,810 |
Materials and supplies | 414 |  |  | 485 |
Merchandise | 156 |  |  | 153 |
Total | $ | 5,392 |  |  | $ | 5,656 |
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 liquidations of LIFO inventories for the three months ended March 31, 2017 and 2016.

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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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 + Details
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