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Inventories Schedule of Inventory (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019 | Jun. 30, 2020 | Dec. 31, 2019 | Sep. 01, 2017
Inventory [Line Items] |  |  |  |  |
Finished Products | $ 2,103 | $ 2,103 | $ 1,831 | $ 2,684 |
Semi-finished Products | 1,373 | 1,373 | 1,364 | 1,850 |
Raw Materials and Supplies | 442 | 442 | 394 | 498 |
Total inventories | 3,918 | 3,918 | $ 3,589 | $ 5,032 |
Merger with Dow [Member] |  |  |  |  |
Inventory [Line Items] |  |  |  |  |
Business Combination, Fair Value Step Up Of Acquired Inventory |  |  |  |  | $ 2,297
Amortization of inventory step up included in COGS | $ 52 | $ 257 |  |  |

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