Earnings Per Share of Common Stock Share Count Information (Details) - shares		4 Months Ended	8 Months Ended	12 Months Ended
		Dec. 31, 2017	Aug. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Jun. 03, 2019	Jun. 01, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted Average Number of Shares Outstanding, Basic	[1]	749,400,000	867,900,000	749,500,000	749,400,000
Dilutive effect of equity compensation plans	[2]	0	4,500,000	0	0
Weighted Average Number of Shares Outstanding, Diluted		749,400,000	872,400,000	749,500,000	749,400,000
Stock options and restricted stock units excluded from EPS	[3]	0	0	14,400,000	0
Common Stock, Shares Authorized				1,666,667,000
Shares in which vesting conditions were met							600,000
Corteva [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common Stock, Shares, Issued							748,815,000
Corteva [Member] | Corteva [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common Stock, Shares Authorized						748,815,000	748,815,000
Common Stock [Member] | Corteva [Member] | Corteva [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common Stock, Shares Authorized							748,800,000

[1] Share amounts for all periods prior to the Corteva Distribution were based on 748.8 million shares of Corteva, Inc. common stock distributed to holders of DowDuPont's common stock on June 1, 2019, plus 0.6 million of additional shares in which accelerated vesting conditions have been met.

[2] Diluted earnings per share considers the impact of potentially dilutive securities except in periods in which there is a loss because the inclusion of the potential common shares would have an anti-dilutive effect.

[3] These outstanding potential shares of common stock were excluded from the calculation of diluted earnings per share because the effect of including them would have been anti-dilutive.