Stockholders' Equity Common Stock (Details) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2019 USD ($) $ / shares shares		Jul. 30, 2020 $ / shares	Dec. 31, 2019 $ / shares	Jun. 26, 2019 USD ($) $ / shares	Jun. 01, 2019 shares $ / shares
Class of Stock [Line Items]
Common Stock, Par Value | $ / shares	$ 0.01	$ 0.01		$ 0.01	$ 0.01
Common Stock, Shares, Outstanding, Beginning Balance	748,577,000
Common Stock, Shares, Outstanding, Ending Balance	748,485,000	748,815,000
Stock Repurchase Program, Authorized Amount | $						$ 1,000
Payments for Repurchase of Common Stock | $	$ 50	$ 0	[1]
Corteva [Member]
Class of Stock [Line Items]
Common Stock, Shares, Issued							748,815,000
Common Stock, Par Value | $ / shares	$ 0.01					$ 0.01	$ 0.01
Common Stock, Shares, Outstanding, Beginning Balance	748,577,000
Common Stock, Shares, Issued	1,773,000
Stock Repurchased and Retired During Period, Shares	(1,865,000)
Common Stock, Shares, Outstanding, Ending Balance	748,485,000
Payments for Repurchase of Common Stock | $	$ 50
Corteva [Member] | Shares of Corteva Stock [Member]
Class of Stock [Line Items]
Exchange Ratio							1
Corteva [Member] | Shares of DowDuPont Common Stock Held [Member]
Class of Stock [Line Items]
Exchange Ratio							3

[1] The cash flows for the six months ended June 30, 2019 includes cash flows of EID's ECP and Specialty Products Entities.