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Inventory (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Inventory Disclosure [Abstract] |  |  |  |  |
Raw materials | $ 70 |  | $ 70 |  | $ 75
Materials and supplies | 945 |  | 945 |  | 974
Commodity inventory and finished goods | 503 |  | 503 |  | 572
Inventories, gross | 1,518 |  | 1,518 |  | 1,621
Revaluation to LIFO | (41) |  | (41) |  | (40)
Total | 1,477 |  | 1,477 |  | $ 1,581
Inventory [Line Items] |  |  |  |  |
Impairment recognized due to lower than cost or market adjustments | 42 |  | 54 |  |
Commodity Inventories |  |  |  |  |
Inventory [Line Items] |  |  |  |  |
Impairment recognized due to lower than cost or market adjustments | $ 7 | $ 0 | $ 76 | $ 0 |

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