Stockholders' Equity Common Stock (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares		Dec. 31, 2018 USD ($)	[1]	Feb. 04, 2021 $ / shares	Jun. 26, 2019 USD ($) $ / shares	Jun. 03, 2019 $ / shares shares	Jun. 01, 2019 shares	Nov. 02, 2017 USD ($)
Equity, Class of Treasury Stock [Line Items]
Common Stock, Shares Authorized	1,666,667,000	1,666,667,000
Common Stock, Par Value | $ / shares	$ 0.01	$ 0.01				$ 0.01
Common Stock, Shares, Outstanding	743,458,000	748,577,000							748,815,000
Stock Issued During Period, Shares, New Issues	3,384,000	586,000
Stock Repurchased and Retired During Period, Shares	(8,503,000)	(824,000)
Stock Repurchase Program, Authorized Amount | $							$ 1,000			$ 4,000
Payments for Repurchase of Common Stock | $	$ 275	$ 25	[1]	$ 0
Payments for Repurchase of Common Stock | $	$ 275	$ 25	[1]	$ 0
Corteva [Member]
Equity, Class of Treasury Stock [Line Items]
Common Stock, Shares Authorized								748,815,000
Common Stock, Par Value | $ / shares							$ 0.01	$ 0.01
Common Stock, Shares, Issued									748,815,000
Corteva [Member] | Shares of Corteva Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Exchange Ratio									1
Corteva [Member] | Shares of DowDuPont Common Stock Held [Member]
Equity, Class of Treasury Stock [Line Items]
Exchange Ratio									3
Corteva [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased and Retired During Period, Shares	8,503,000	824,000
Common Stock, Shares, Issued									748,815,000

[1] The cash flows for the years ended December 31, 2018 and 2019 includes cash flows of EID's ECP and Specialty Products Entities.