Earnings Per Share Share Count Information (Details) - shares		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 03, 2019	Jun. 01, 2019	Dec. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted Average Number of Shares Outstanding, Basic	[1]	749,400,000	749,400,000	749,400,000	749,400,000
Dilutive effect of equity compensation plans		600,000	0	300,000	0
Weighted Average Number of Shares Outstanding, Diluted		750,000,000.0	749,400,000	749,700,000	749,400,000
Stock options and restricted stock units excluded from EPS		7,800,000	0	7,800,000	0
Common Stock, Shares, Issued		748,815,000	748,815,000	748,815,000	748,815,000			748,815,000
Corteva [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common Stock, Shares, Issued						748,815,000
Shares in which vesting conditions were met							600,000

[1] Share amounts for the three and six months ended June 30, 2018, 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.