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Inventories Schedule of Inventory (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020 | Sep. 01, 2017
Inventory [Line Items] |  |  |  |  |  |  |
Finished products |  |  |  | $ 2,684 |  | $ 2,584 |
Semi-finished products |  |  |  | 1,850 |  | 1,813 |
Raw materials and supplies |  |  |  | 498 |  | 485 |
Total inventories |  |  |  | 5,032 |  | $ 4,882 |
Merger with Dow [Member] |  |  |  |  |  |  |
Inventory [Line Items] |  |  |  |  |  |  |
Fair Value Step-up |  |  |  |  |  |  | $ 2,297
Amortization of Fair Value Step-up | $ 15 | $ 52 | $ 205 | $ 272 | $ 1,554 |  |

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