Stockholders' Equity Common Stock (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Apr. 30, 2021	Dec. 31, 2020	Jun. 26, 2019
Class of Stock [Line Items]
Common Stock, Par Value	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Stock Repurchase Program, Authorized Amount					$ 1,000
Repurchase of Common Stock	$ 350	$ 50
Corteva [Member]
Class of Stock [Line Items]
Common Stock, Par Value	$ 0.01				$ 0.01
Stock Repurchased and Retired During Period, Shares	7,646	1,865