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Inventories (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Inventories |  |  |  |  |  |  |  |
Refinery feedstocks | $ 1,979 |  |  |  |  | $ 1,979 | $ 2,399 |
Refined petroleum products and blendstocks | 3,425 |  |  |  |  | 3,425 | 4,034 |
Renewable diesel feedstocks and products | 50 |  |  |  |  | 50 | 46 |
Ethanol feedstocks and products | 297 |  |  |  |  | 297 | 260 |
Materials and supplies | 287 |  |  |  |  | 287 | 274 |
Inventories | 6,038 |  |  |  |  | 6,038 | 7,013 |
Inventories (Textual) |  |  |  |  |  |  |  |
LCM inventory valuation reserve |  |  | $ 2,500 |  |  |  |  |
Lower of cost or market (LCM) inventory valuation adjustment |  |  | $ 2,500 | $ (300) | $ (2,200) | (19) | 0 | $ 0
Excess of market value over carrying amount of LIFO inventories | 1,300 |  |  |  |  | 1,300 | 2,500 |
Liquidation of LIFO inventory, increase to cost of materials and other | (102) | $ 326 |  |  |  | 224 |  |
Amount of non-LIFO inventory | $ 918 |  |  |  |  | $ 918 | $ 1,400 |

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