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Stockholders' Equity Common Stock (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Aug. 05, 2021 | Jul. 30, 2021 | Dec. 31, 2020 | Jun. 26, 2019
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common Stock, Par Value | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01 |  | $ 0.01 | $ 0.01 |
Repurchase of Common Stock |  |  | $ 750 | $ 83 |  |  |  |
2019 Share Buyback Plan |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Shares | 3,408 | 1,160 | 15,378 | 3,025 |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  | $ 1,000
Repurchase of Common Stock | $ 150 | $ 33 | $ 700 | $ 83 |  |  |  |
2021 Stock Repurchase Program |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Shares | 1,167 |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  | $ 1,500 |  |  |
Repurchase of Common Stock | $ 50 |  |  |  |  |  |  |
Corteva [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common Stock, Par Value | $ 0.01 |  | $ 0.01 |  | $ 0.01 |  |  |

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