Goodwill and Other Intangible Assets Acquired Intangible Assets (Details) - Merger with Dow [Member] $ in Millions	Aug. 31, 2017 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 15,436
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	27,221	[1]
In Process Research and Development [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets Acquired	660
Germplasm [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets Acquired	6,263
Trademarks and Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets Acquired	4,862
Customer-Related Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 9,264
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	17 years
Developed Technology Rights [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 4,239
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	12 years
Trademarks and Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 1,080
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	15 years
Microbial Cell Factories [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 400
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	23 years
Other Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 453
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	17 years

[1] See Note 12 for additional information.