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Inventories (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Inventories |  |
Refinery feedstocks | $ 2,213 | $ 2,427
Refined petroleum products and blendstocks | 3,717 | 3,459
Ethanol feedstocks and products | 231 | 242
Materials and supplies | 259 | 256
Inventories | 6,420 | 6,384
Inventories (Textual) |  |
Excess of market value over carrying amount of LIFO inventories | 3,900 | 3,000
Amount of non-LIFO inventory | $ 1,100 | $ 1,000

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- Definition Gross amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)(4),(5)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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