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Inventories (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
--- | --- | --- | ---
Schedule of Inventories |  |  |
Refinery feedstocks | $ 1,947 | $ 1,979 |
Refined petroleum products and blendstocks | 3,284 | 3,425 |
Renewable diesel feedstocks and products | 64 | 50 |
Ethanol feedstocks and products | 297 | 297 |
Materials and supplies | 289 | 287 |
Inventories | 5,881 | 6,038 |
Inventories (Textual) |  |  |
LCM inventory valuation reserve |  |  | $ 2,500
Excess of market value over carrying amount of LIFO inventories | 2,700 | 1,300 |
Amount of non-LIFO inventory | $ 1,200 | $ 918 |

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