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Goodwill and Other Intangible Assets Other Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2020
Intangible Assets [Line Items] |  |  |  |  |
Definite-Lived Intangible Assets, Gross |  | $ 10,750 |  |  | $ 12,599
Accumulated Amortization |  | (1,207) |  |  | (1,862)
Definite-Lived Intangible Assets, Net |  | 9,543 |  |  | 10,737
Indefinite-lived Intangible Assets |  | 1,881 |  |  | 10
Total Intangible Assets, Gross |  | 12,631 |  |  | 12,609
Total intangible assets - net |  | 11,424 |  |  | 10,747
IPR&D [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Indefinite-lived Intangible Assets |  | 10 |  |  | 10
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  | 90 | $ 54 | $ 85 |
Impairment of Intangible Assets Indefinite lived Excluding Goodwill After Tax |  | 69 | $ 41 | $ 66 |
Trademarks and Trade Names [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Indefinite-lived Intangible Assets | [1] | 1,871 |  |  |
Germplasm [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Definite-Lived Intangible Assets, Gross | [2] | 6,265 |  |  | 6,265
Accumulated Amortization | [2] | (63) |  |  | (317)
Definite-Lived Intangible Assets, Net | [2] | 6,202 |  |  | 5,948
Customer-Related Intangible Assets [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Definite-Lived Intangible Assets, Gross |  | 1,977 |  |  | 1,984
Accumulated Amortization |  | (268) |  |  | (380)
Definite-Lived Intangible Assets, Net |  | 1,709 |  |  | 1,604
Developed Technology [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Definite-Lived Intangible Assets, Gross |  | 1,463 |  |  | 1,451
Accumulated Amortization |  | (370) |  |  | (525)
Definite-Lived Intangible Assets, Net |  | 1,093 |  |  | 926
Trademarks and Trade Names [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Definite-Lived Intangible Assets, Gross | [1] | 166 |  |  | 2,019
Accumulated Amortization | [1] | (86) |  |  | (99)
Definite-Lived Intangible Assets, Net | [1] | 80 |  |  | 1,920
Favorable Supply Contract [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Definite-Lived Intangible Assets, Gross |  | 475 |  |  | 475
Accumulated Amortization |  | (207) |  |  | (302)
Definite-Lived Intangible Assets, Net |  | 268 |  |  | 173
Other Intangible Assets [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Definite-Lived Intangible Assets, Gross | [3] | 404 |  |  | 405
Accumulated Amortization | [3] | (213) |  |  | (239)
Definite-Lived Intangible Assets, Net | [3] | $ 191 |  |  | $ 166
[1] | Beginning on October 1, 2020, the company changed its indefinite life assertion of its trade name asset to definite lived with a useful life of 25 years. This change is the result of the launch of Brevant TM seed in the retail channel in the U.S. Prior to changing the useful life of the trade name asset, the company tested the asset for impairment under ASC 350 - Intangibles, Goodwill and Other, concluding the asset was not impaired.
[2] | Beginning on October, 1, 2019, the company changed its indefinite life assertion of germplasm assets to definite lived with a useful life of 25 years. The change is a result of a more focused development effort of new seed products coupled with an intent to out license select germplasm on a nonexclusive basis. Prior to changing the useful life of the germplasm assets, the company tested the assets for impairment under ASC 350 - Intangibles, Goodwill and Other, concluding the assets were not impaired. The increase in accumulated amortization for the year ended December 31, 2020 when compared to the year ended December 31, 2019 is due to 2020 including a full year of amortization of germplasm assets
[3] | Primarily consists of sales and farmer networks, marketing and manufacturing alliances and noncompetition agreements.

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