Stockholders' Equity Common Stock (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Aug. 05, 2021	Jul. 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		$ 0.01	$ 0.01
Repurchase of Common Stock			$ 750	$ 83
2019 Share Buyback Plan
Class of Stock [Line Items]
Stock Repurchased and Retired During Period, Shares	3,408	1,160	15,378	3,025
Stock Repurchase Program, Authorized Amount								$ 1,000
Repurchase of Common Stock	$ 150	$ 33	$ 700	$ 83
2021 Stock Repurchase Program
Class of Stock [Line Items]
Stock Repurchased and Retired During Period, Shares	1,167
Stock Repurchase Program, Authorized Amount					$ 1,500
Repurchase of Common Stock	$ 50
Corteva [Member]
Class of Stock [Line Items]
Common Stock, Par Value	$ 0.01		$ 0.01		$ 0.01