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Stockholders' Equity Common Stock (Details) $ / shares in Units, $ in Millions | 3 Months Ended | 4 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) $ / shares shares | Sep. 30, 2019 $ / shares shares | Sep. 30, 2019 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) $ / shares shares | Jun. 26, 2019 USD ($) | Jun. 01, 2019 shares | Dec. 31, 2018 $ / shares shares | Nov. 02, 2017 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common Stock, Shares, Outstanding | 748,390,000 | 748,390,000 | 748,390,000 |  |  |  |  |
Common Stock, Par Value | $ / shares | $ 0.01 | $ 0.01 | $ 0.01 |  |  |  |  |
Stock Repurchase Program, Authorized Amount | $ |  |  |  |  | $ 1,000 |  |  | $ 4,000
Payments for Repurchase of Common Stock | $ | $ 25 |  | $ 25 | $ 0 |  |  |  |
Corteva [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common Stock, Shares, Outstanding | 748,390,000 | 748,390,000 | 748,390,000 |  |  | 748,815,000 |  |
Common Stock, Par Value | $ / shares | $ 0.01 | $ 0.01 | $ 0.01 |  |  |  |  |
Common Stock, Shares, Issued |  | 399,000 |  |  |  |  |  |
Stock Repurchased and Retired During Period, Shares | 824,000 | (824,000) |  |  |  |  |  |
Corteva [Member] | Shares of Corteva Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Exchange Ratio |  |  |  |  |  | 1 |  |
Corteva [Member] | Shares of DowDuPont Common Stock Held [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Exchange Ratio |  |  |  |  |  | 3 |  |
EID [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common Stock, Shares, Outstanding | 200 | 200 | 200 | 100 |  |  | 100 |
Common Stock, Par Value | $ / shares | $ 0.30 | $ 0.30 | $ 0.30 | $ 0.30 |  |  | $ 0.30 |
EID [Member] | Corteva [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Ownership interest in an entity |  |  | 100.00% |  |  |  |  |

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