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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Background and Basis of Presentation Background and Basis of Presentation (Details) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2019 USD ($)	Sep. 30, 2019 yr $ / shares shares	Jun. 03, 2019 $ / shares shares	Jun. 01, 2019 shares $ / shares	Apr. 01, 2019 $ / shares	Dec. 31, 2018 $ / shares shares	Sep. 30, 2018 $ / shares shares
Common Stock, Par Value \| $ / shares		$ 0.01
Common Stock, Shares Authorized		1,666,666,667
Reclassification of Divisional Equity to APIC \| $	$ 0
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	$ 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
Reclassification of Divisional Equity to APIC \| $	0
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
Internal Reorganization [Member]
Reclassification of Divisional Equity to APIC \| $	$ 76