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Inventories | 12 Months Ended
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Dec. 31, 2015
Inventory Disclosure [Abstract] |
INVENTORIES |
6. | INVENTORIES
Inventories consisted of the following (in millions):
| December 31,
| 2015 |  | 2014
Refinery feedstocks | $ | 2,404 |  |  | $ | 2,269 |
Refined products and blendstocks | 3,774 |  |  | 3,926 |
Ethanol feedstocks and products | 242 |  |  | 195 |
Materials and supplies | 244 |  |  | 233 |
Inventories, before lower of cost or market inventory valuation reserve | 6,664 |  |  | 6,623 |
Lower of cost or market inventory valuation reserve | (766 | ) |  | — |
Inventories | $ | 5,898 |  |  | $ | 6,623 |
The market value of our LIFO inventory held as of December 31, 2015 fell below our historical LIFO inventory costs. As a result, we recorded a lower of cost or market inventory valuation adjustment of $790 million for the year ended December 31, 2015. The income statement effect differs from the balance sheet reserve due to the foreign currency effect of inventories held for our international operations. As of December 31, 2014, the market value of LIFO inventories exceeded their LIFO carrying amounts by approximately $857 million. During the year ended December 31, 2013, we had net liquidations of LIFO inventory layers that decreased cost of sales by $17 million. As of December 31, 2015 and 2014, our non-LIFO inventories accounted for $668 million and $906 million, respectively, of our total inventories.

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- Definition The entire disclosure for inventory. This may include, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the major classes of inventory, and the nature of the cost elements included in inventory. If inventory is stated above cost, accrued net losses on firm purchase commitments for inventory and losses resulting from valuing inventory at the lower-of-cost-or-market may also be included. For LIFO inventory, may disclose the amount and basis for determining the excess of replacement or current cost over stated LIFO value and the effects of a LIFO quantities liquidation that impacts net income. + 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 6 -Subparagraph a, b, c -Article 5 + Details
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