Background and Basis of Presentation (Details) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2020 USD ($)	Dec. 31, 2020 $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Feb. 04, 2021 $ / shares	Jun. 26, 2019 $ / shares	Jun. 03, 2019 $ / shares shares	Jun. 01, 2019	Apr. 01, 2019 $ / shares
Common Stock, Par Value		$ 0.01	$ 0.01	$ 0.01
Common Stock, Shares Authorized | shares		1,666,667,000	1,666,667,000
Reclassification of Divisional Equity to Additional Paid in Capital | $			$ 0
Internal Reorganization [Member]
Reclassification of Divisional Equity to Additional Paid in Capital | $	$ 40
EID [Member]
Common Stock, Par Value		$ 0.30	$ 0.30	$ 0.30
Common Stock, Shares Authorized | shares		1,800,000,000	1,800,000,000
Reclassification of Divisional Equity to Additional Paid in Capital | $			$ 0
EID [Member] | Corteva [Member]
Ownership interest in an entity		100.00%
DAS [Member] | EID [Member]
Ownership interest in an entity		100.00%
Dow [Member]
Common Stock, Par Value								$ 0.01
Corteva [Member]
Number of Reportable Segments		2
Common Stock, Par Value					$ 0.01	$ 0.01
Common Stock, Shares Authorized | shares						748,815,000
Number of Countries in which Entity Operates		140
Shares of DowDuPont Common Stock Held [Member] | Corteva [Member]
Exchange Ratio							3
Shares of Corteva Stock [Member] | Corteva [Member]
Exchange Ratio							1