Earnings Per Share Share Count Information (Details) - shares		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Jun. 01, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted Average Common Shares - basic	[1]	749,500,000	749,500,000	749,500,000	749,400,000
Dilutive effect of equity compensation plans	[2]	0	0	2,500,000	0
Weighted Average Common Shares - diluted		749,500,000	749,500,000	752,000,000.0	749,400,000
Potential shares of common stock excluded from EPS calculations	[3]	14,600,000	13,800,000	9,700,000	13,800,000
Common Stock, Shares Authorized		1,666,667,000	1,666,667,000	1,666,667,000	1,666,667,000	1,666,667,000
Corteva [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares in which vesting conditions were met							600,000
Common Stock, Shares, Issued							748,815,000
Corteva [Member] | Rounded Amount [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common Stock, Shares, Issued							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 relating to stock options, restricted stock units and performance-based restricted stock units were excluded from the calculation of diluted earnings per share because the effect of including them would have been anti-dilutive.