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Earnings Per Share of Common Stock (Tables)
 12 Months Ended
Dec. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]  
Earnings Per Share of Common Stock Reconciliation
Net (Loss) Income for Earnings Per Share Calculations - Basic and Diluted
Successor
Predecessor
(In millions)
For the Year Ended December 31, 2019
For the Year Ended December 31, 2018
For the Period September 1 through December 31, 2017
For the Period January 1 through August 31, 2017
(Loss) income from continuing operations after income taxes
$
(270
)
$
(6,775
)
$
1,760

$
358

Net income attributable to continuing operations noncontrolling interests
13

29

10

8

(Loss) income from continuing operations attributable to Corteva common stockholders
(283
)
(6,804
)
1,750

350

(Loss) income from discontinued operations, net of tax
(671
)
1,748

(568
)
1,403

Net income attributable to discontinued operations noncontrolling interests
5

9

—

19

(Loss) income from discontinued operations attributable to Corteva common stockholders
(676
)
1,739

(568
)
1,384

Net (loss) income attributable to common stockholders
$
(959
)
$
(5,065
)
$
1,182

$
1,734
Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table Text Block]
(Loss) Earnings Per Share Calculations - Basic
Successor
Predecessor
(Dollars per share)
For the Year Ended December 31, 2019
For the Year Ended December 31, 2018
For the Period September 1 through December 31, 2017
For the Period January 1 through August 31, 2017
(Loss) earnings per share of common stock from continuing operations
$
(0.38
)
$
(9.08
)
$
2.34

$
0.40

(Loss) earnings per share of common stock from discontinued operations
(0.90
)
2.32

(0.76
)
1.60

(Loss) earnings per share of common stock
$
(1.28
)
$
(6.76
)
$
1.58

$
2.00
Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table Text Block]
(Loss) Earnings Per Share Calculations - Diluted
Successor
Predecessor
(Dollars per share)
For the Year Ended December 31, 2019
For the Year Ended December 31, 2018
For the Period September 1 through December 31, 2017
For the Period January 1 through August 31, 2017
(Loss) earnings per share of common stock from continuing operations
$
(0.38
)
$
(9.08
)
$
2.34

$
0.40

(Loss) earnings per share of common stock from discontinued operations
(0.90
)
2.32

(0.76
)
1.59

(Loss) earnings per share of common stock
$
(1.28
)
$
(6.76
)
$
1.58

$
1.99
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
Share Count Information
Successor
Predecessor
(Shares in millions)
For the Year Ended December 31, 2019
For the Year Ended December 31, 2018
For the Period September 1 through December 31, 2017
For the Period January 1 through August 31, 2017
Weighted-average common shares - basic1
749.5

749.4

749.4

867.9

Plus dilutive effect of equity compensation plans2
—

—

—

4.5

Weighted-average common shares - diluted
749.5

749.4

749.4

872.4

Potential shares of common stock excluded from EPS calculations3
14.4

—

—

—

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.