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Related Party Transactions Transactions with DowDuPont (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jun. 26, 2019 | Dec. 31, 2018 | Nov. 02, 2017
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  | $ 1,000 |  | $ 4,000
Payments of Distributions to Affiliates | $ 317 | $ 823 | $ 828 | $ 830 | $ 317 | $ 2,481 |  |  |
DowDuPont [Member] |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Payments of Distributions to Affiliates |  |  |  |  | $ 317 | 2,481 |  |  |
Accounts Payable, Related Parties |  | $ 250 |  |  |  | $ 250 |  | $ 103 |

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