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Inventories | 3 Months Ended
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Mar. 31, 2018
Inventory Disclosure [Abstract] |
INVENTORIES |
2. | INVENTORIES
Inventories consisted of the following (in millions):
| March 31, 2018 |  | December 31, 2017
Refinery feedstocks | $ | 2,471 |  |  | $ | 2,427 |
Refined petroleum products and blendstocks | 3,569 |  |  | 3,459 |
Ethanol feedstocks and products | 258 |  |  | 242 |
Materials and supplies | 257 |  |  | 256 |
Inventories | $ | 6,555 |  |  | $ | 6,384 |
As of March 31, 2018 and December 31, 2017, the replacement cost (market value) of LIFO inventories exceeded their LIFO carrying amounts by $3.1 billion and $3.0 billion, respectively, and our non-LIFO inventories accounted for $905 million and $1.0 billion, respectively, of our total inventories.

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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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