Goodwill and Other Intangible Assets Other Intangible Assets (Details) - USD ($) $ in Millions		3 Months Ended		12 Months Ended
		Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2021	Dec. 31, 2020
Intangible Assets [Line Items]
Definite-Lived Intangible Assets, Gross					$ 12,595	$ 12,599
Accumulated Amortization					(2,561)	(1,862)
Definite-Lived Intangible Assets, Net					10,034	10,737
Indefinite-lived Intangible Assets					10	10
Total Intangible Assets, Gross					12,605	12,609
Total intangible assets - net					10,044	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	$ 144
Impairment of Intangible Assets Indefinite lived Excluding Goodwill After Tax		$ 69	$ 41	$ 110
Germplasm [Member]
Intangible Assets [Line Items]
Definite-Lived Intangible Assets, Gross					6,265	6,265
Accumulated Amortization					(571)	(317)
Definite-Lived Intangible Assets, Net					5,694	5,948
Customer-Related Intangible Assets [Member]
Intangible Assets [Line Items]
Definite-Lived Intangible Assets, Gross					1,953	1,984
Accumulated Amortization					(487)	(380)
Definite-Lived Intangible Assets, Net					1,466	1,604
Developed Technology [Member]
Intangible Assets [Line Items]
Definite-Lived Intangible Assets, Gross					1,485	1,451
Accumulated Amortization					(679)	(525)
Definite-Lived Intangible Assets, Net					806	926
Trademarks and Trade Names [Member]
Intangible Assets [Line Items]
Definite-Lived Intangible Assets, Gross	[1]				2,012	2,019
Accumulated Amortization	[1]				(172)	(99)
Definite-Lived Intangible Assets, Net	[1]				1,840	1,920
Favorable Supply Contract [Member]
Intangible Assets [Line Items]
Definite-Lived Intangible Assets, Gross					475	475
Accumulated Amortization					(396)	(302)
Definite-Lived Intangible Assets, Net					79	173
Other Intangible Assets [Member]
Intangible Assets [Line Items]
Definite-Lived Intangible Assets, Gross	[2]				405	405
Accumulated Amortization	[2]				(256)	(239)
Definite-Lived Intangible Assets, Net	[2]				$ 149	$ 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 BrevantTM 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] Primarily consists of sales and farmer networks, marketing and manufacturing alliances and noncompetition agreements.