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Stockholders' Equity Common Stock (Details) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) $ / shares shares | Oct. 29, 2020 $ / shares | Dec. 31, 2019 $ / shares | Jun. 26, 2019 USD ($) $ / shares | Jun. 01, 2019 shares $ / shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common Stock, Par Value | $ / shares | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01 |  | $ 0.01 | $ 0.01 |  |
Common Stock, Shares, Outstanding, Beginning Balance |  |  | 748,577,000 |  |  |  |  |  |
Common Stock, Shares, Outstanding, Ending Balance | 747,492,000 | 748,390,000 | 747,492,000 | 748,390,000 |  |  |  |  |
Stock Repurchase Program, Authorized Amount | $ |  |  |  |  |  |  |  | $ 1,000 |
Repurchase of Common Stock | $ | $ 33 | $ 25 | $ 83 | $ 25 | [1] |  |  |  |
Corteva [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common Stock, Shares, Issued |  |  |  |  |  |  |  |  | 748,815,000
Common Stock, Par Value | $ / shares | $ 0.01 |  | $ 0.01 |  |  |  |  | $ 0.01 | $ 0.01
Common Stock, Shares, Outstanding, Beginning Balance |  |  | 748,577,000 |  |  |  |  |  |
Common Stock, Shares, Issued |  |  | 1,940,000 |  |  |  |  |  |
Stock Repurchased and Retired During Period, Shares | 1,160,000 | 824,000 | (3,025,000) |  |  |  |  |  |
Common Stock, Shares, Outstanding, Ending Balance | 747,492,000 |  | 747,492,000 |  |  |  |  |  |
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
[1] | The cash flows for the nine months ended September 30, 2019 includes cash flows of EID's ECP and Specialty Products Entities.

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