Background and Basis of Presentation Background and Basis of Presentation (Details)	6 Months Ended
	Jun. 30, 2019 yr $ / shares shares	Jun. 03, 2019 shares	Jun. 01, 2019 shares $ / shares	Apr. 01, 2019 $ / shares	Dec. 31, 2018 $ / shares shares	Jun. 30, 2018 $ / shares shares
Common Stock, Par Value | $ / shares	$ 0.01				$ 0.01	$ 0.01
Common Stock, Shares Authorized	1,666,666,667				1,666,666,667	1,666,666,667
Common Stock, Shares, Issued	748,815,000				748,815,000	748,815,000
Corteva [Member]
Years of Experience | yr	275
Number of Countries in which Entity Operates	140
Number of Reportable Segments	2
Common Stock, Par Value | $ / shares			$ 0.01
Common Stock, Shares Authorized		748,815,000
Common Stock, Shares, Issued		748,815,000
DAS [Member] | EID [Member]
Ownership interest in an entity	100.00%
Dow [Member]
Common Stock, Par Value | $ / shares				$ 0.01
Corteva [Member]
Common Stock, Par Value | $ / shares			$ 0.01
EID [Member]
Common Stock, Par Value | $ / shares	$ 0.30				$ 0.30	$ 0.30
Common Stock, Shares Authorized	1,800,000,000				1,800,000,000	1,800,000,000
Common Stock, Shares, Issued	200				100	100
EID [Member] | Corteva [Member]
Ownership interest in an entity	100.00%
Shares of DowDuPont Common Stock Held [Member] | Corteva [Member]
Exchange Ratio			3
Shares of Corteva Stock [Member] | Corteva [Member]
Exchange Ratio			1