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Background and Basis of Presentation Background and Basis of Presentation (Details) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 USD ($) | Sep. 30, 2019 yr $ / shares shares | Jun. 03, 2019 $ / shares shares | Jun. 01, 2019 shares $ / shares | Apr. 01, 2019 $ / shares | Dec. 31, 2018 $ / shares shares | Sep. 30, 2018 $ / shares shares
Common Stock, Par Value | $ / shares |  | $ 0.01 |  |  |  |  |
Common Stock, Shares Authorized |  | 1,666,666,667 |  |  |  |  |
Reclassification of Divisional Equity to APIC | $ | $ 0 |  |  |  |  |  |
Corteva [Member] |  |  |  |  |  |  |
Years of Experience | yr |  | 275 |  |  |  |  |
Number of Countries in which Entity Operates |  | 140 |  |  |  |  |
Number of Reportable Segments |  | 2 |  |  |  |  |
Common Stock, Par Value | $ / shares |  | $ 0.01 |  |  |  |  |
Common Stock, Shares Authorized |  |  | 748,815,000 |  |  |  |
Common Stock, Shares, Issued |  |  | 748,815,000 |  |  |  |
DAS [Member] | EID [Member] |  |  |  |  |  |  |
Ownership interest in an entity |  | 100.00% |  |  |  |  |
Dow [Member] |  |  |  |  |  |  |
Common Stock, Par Value | $ / shares |  |  |  |  | $ 0.01 |  |
Corteva [Member] |  |  |  |  |  |  |
Common Stock, Par Value | $ / shares |  |  | $ 0.01 | $ 0.01 |  |  |
EID [Member] |  |  |  |  |  |  |
Common Stock, Par Value | $ / shares |  | $ 0.30 |  |  |  | $ 0.30 | $ 0.30
Common Stock, Shares Authorized |  | 1,800,000,000 |  |  |  | 1,800,000,000 | 1,800,000,000
Reclassification of Divisional Equity to APIC | $ | 0 |  |  |  |  |  |
EID [Member] | Corteva [Member] |  |  |  |  |  |  |
Ownership interest in an entity |  | 100.00% |  |  |  |  |
Shares of DowDuPont Common Stock Held [Member] | Corteva [Member] |  |  |  |  |  |  |
Exchange Ratio |  |  |  | 3 |  |  |
Shares of Corteva Stock [Member] | Corteva [Member] |  |  |  |  |  |  |
Exchange Ratio |  |  |  | 1 |  |  |
Internal Reorganization [Member] |  |  |  |  |  |  |
Reclassification of Divisional Equity to APIC | $ | $ 76 |  |  |  |  |  |

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