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Inventory (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Inventory Disclosure [Abstract] |  |
Raw materials | $ 63 | $ 75
Materials and supplies | 885 | 974
Finished goods | 753 | 572
Inventories, gross | 1,701 | 1,621
Revaluation to LIFO | (41) | (40)
Total | 1,660 | $ 1,581
Inventory [Line Items] |  |
Impairment recognized due to lower than cost or market adjustments | 54 |
Commodity Inventories |  |
Inventory [Line Items] |  |
Impairment recognized due to lower than cost or market adjustments | $ 76 |

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