Stockholders' Equity Common Stock (Details) $ / shares in Units, $ in Millions	4 Months Ended	7 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2019 $ / shares shares	Aug. 31, 2017 USD ($)	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($)	Feb. 07, 2020 $ / shares	Jun. 26, 2019 USD ($)	Jun. 03, 2019 $ / shares shares	Jun. 01, 2019 $ / shares 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 or Stated Value Per Share | $ / shares		$ 0.01		$ 0.01		$ 0.01
Common Stock, Shares, Outstanding		748,577,000		748,577,000					748,815,000
Stock Issued During Period, Shares, New Issues		586,000
Stock Repurchased and Retired During Period, Shares		(824,000)
Stock Repurchase Program, Authorized Amount | $							$ 1,000			$ 4,000
Payments for Repurchase of Common Stock | $	$ 0		$ 0	$ 25	$ 0
Corteva [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased and Retired During Period, Shares				824,000
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] | Corteva [Member]
Equity, Class of Treasury Stock [Line Items]
Common Stock, Shares Authorized								748,815,000	748,815,000
Common Stock, Par or Stated Value Per Share | $ / shares								$ 0.01	$ 0.01