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Goodwill and Other Intangible Assets Goodwill by Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 4 Months Ended | 5 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | May 31, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill Beginning Balance |  |  |  | $ 10,179 | $ 10,193 |  | $ 10,193 |  |  |
Currency Translation Adjustment |  |  |  | (11) | (28) |  |  |  |  |
Other goodwill adjustments and acquisitions |  |  |  |  | 14 |  |  |  |  |
Segment realignment |  |  |  |  | 0 |  |  |  |  |
Goodwill Ending Balance |  | $ 10,168 | $ 10,203 | 10,168 |  |  | 10,168 |  | $ 10,203 |
Goodwill impairment charge |  | 0 | 4,503 |  |  |  | 0 |  | 4,503 |
Agriculture [Member] |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill Beginning Balance |  |  |  | 0 | 10,193 | [1] | 10,193 | [1] |  |
Currency Translation Adjustment |  |  |  | 0 | (28) |  |  |  |  |
Other goodwill adjustments and acquisitions | [2] |  |  |  | 14 |  |  |  |  |
Segment realignment |  |  |  |  | (10,179) |  |  |  |  |
Goodwill Ending Balance |  | 0 |  | 0 |  |  | 0 |  |  |
Goodwill, Impaired, Accumulated Impairment Loss |  |  |  |  |  |  |  |  |  | $ 4,503
Goodwill impairment charge |  |  | 4,503 |  |  |  |  |  | 4,503 |
Crop Protection [Member] |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill Beginning Balance |  |  |  | 4,726 | 0 |  | 0 |  |  |
Currency Translation Adjustment |  |  |  | (5) | 0 |  |  |  |  |
Other goodwill adjustments and acquisitions |  |  |  |  | 0 |  |  |  |  |
Segment realignment |  |  |  |  | 4,726 |  |  |  |  |
Goodwill Ending Balance |  | 4,721 |  | 4,721 |  |  | 4,721 |  |  |
Seed [Member] |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill Beginning Balance |  |  |  | 5,453 | 0 |  | 0 |  |  |
Currency Translation Adjustment |  |  |  | (6) | 0 |  |  |  |  |
Other goodwill adjustments and acquisitions |  |  |  |  | 0 |  |  |  |  |
Segment realignment |  |  |  |  | $ 5,453 |  |  |  |  |
Goodwill Ending Balance |  | 5,447 |  | $ 5,447 |  |  | 5,447 |  |  |
In Process Research and Development [Member] |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  | 54 | 85 |  |  |  | 54 |  | 85 |
Impairment of Intangible Assets Indefinite lived Excluding Goodwill After Tax |  | $ 41 | $ 66 |  |  |  | $ 41 |  | $ 66 |
[1] | Net of accumulated impairment losses of $4,503 million.
[2] | Primarily consists of the acquisition of a distributor in Greece.

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