Stock-Based Compensation Stock Options (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		2 Months Ended		3 Months Ended	4 Months Ended	7 Months Ended	8 Months Ended	12 Months Ended
		May 31, 2019		Mar. 31, 2019	Dec. 31, 2017	Dec. 31, 2019	Aug. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Option Award Vesting Period								3 years
Unrecognized Pretax Compensation Expense Related to Stock Options						$ 4,000		$ 4,000
Remaining Weighted-Average Recognition Period								1 year
Dow [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Option, Expiration Period								10 years
EIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding at beginning of period		21,700	[1]	17,079				17,079
Stock options granted during the period	[2]	2,561
Stock options exercised during the period		(134)		(886)
Stock options forfeited/expired during the period		(129)		(85)
Stock options outstanding at end of period		13,886		16,108					17,079
Stock options exercisable at end of period		12,481		13,314
Stock options outstanding, weighted average exercise price beginning of period		$ 35.41	[1]	$ 53.26				$ 53.26
Stock options granted, weighted average price	[2]	29.95
Stock options exercised during the period, weighted average exercise price		27.24		39.19
Stock options forfeited/expired, weighted average price		35.07		46.87
Stock options outstanding, weighted average exercise price end of period		34.00		54.07					$ 53.26
Stock options exercisable, weighted average exercise price		$ 32.85		$ 51.09
Stock options outstanding, weighted average remaining contractual term		3 years 10 months 24 days		4 years 9 months 3 days
Stock options exercisable, weighted average remaining contractual term		3 years 4 months 20 days		3 years 11 months 8 days
Stock options outstanding, intrinsic value		$ 20,779		$ 76,942
Stock options exercisable, intrinsic value		$ 18,979		$ 74,749
Tax Benefit from Compensation Expense								$ 3,000
EIP [Member] | Corteva [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion - Corteva Distribution	[3]	(13,886)
Conversion - Corteva Distribution, weighted average exercise price	[3]	$ 34.00
EIP [Member] | Internal Reorganization [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Impact of Internal Reorganizations		(10,112)
Impact of Internal Reorganizations, Weighted Average Exercise Price		$ 36.07
OIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of stock options								3,000
Tax Benefit from Compensation Expense								$ 1,000
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Grant Date Fair Value					$ 28.56		$ 16.65	$ 7.29	$ 15.46
Intrinsic value of stock options					$ 19,000		$ 108,000	$ 16,000	$ 50,000
Equity Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding at beginning of period	[4]					10,468
Stock options exercised during the period						(355)
Stock options forfeited/expired during the period						(68)
Stock options outstanding at end of period						10,045		10,045
Stock options exercisable at end of period						8,036		8,036
Stock options outstanding, weighted average exercise price beginning of period	[4]					$ 32.11
Stock options exercised during the period, weighted average exercise price						20.95
Stock options forfeited/expired, weighted average price						38.45
Stock options outstanding, weighted average exercise price end of period						32.47		$ 32.47
Stock options exercisable, weighted average exercise price						$ 30.54		$ 30.54
Stock options outstanding, weighted average remaining contractual term						4 years 8 months 23 days
Stock options exercisable, weighted average remaining contractual term						3 years 11 months 12 days
Stock options outstanding, intrinsic value						$ 20,186		$ 20,186
Stock options exercisable, intrinsic value						$ 19,172		$ 19,172
Grants between 2013 and 2015 [Member] | Equity Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Option, Expiration Period								7 years
Grants between 2016 and 2018 [Member] | Equity Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Option, Expiration Period								10 years

[1] As a result of the Dow Distribution, all outstanding DowDuPont equity awards under the EIP were converted into DowDuPont-denominated awards under the “Employer Method,” or into Dow-denominated awards under the “Shareholder Method,” using a formula designed to preserve the intrinsic value of the awards immediately prior to and subsequent to the Dow Distribution.

[2] As a result of the Dow Distribution, outstanding DowDuPont equity awards under the Heritage Dow Plans were moved to the EIP and were converted into DowDuPont-denominated awards under the “Employer Method,” or into Dow-denominated awards under the “Shareholder Method,” using a formula designed to preserve the intrinsic value of the awards immediately prior to and subsequent to the Dow Distribution. These outstanding equity awards are included in the number of “Granted” awards in the table above.

[3] As a result of the Corteva Distribution, all outstanding DowDuPont equity awards under the EIP were converted into Corteva-denominated awards under the “Employer Method,” or into DuPont-denominated awards under the “Shareholder Method,” using a formula designed to preserve the intrinsic value of the awards immediately prior to and subsequent to the Corteva Distribution and moved to the OIP.

[4] As a result of the Corteva Distribution, all outstanding DowDuPont equity awards under the EIP were converted into Corteva-denominated awards under the “Employer Method,” or into DuPont-denominated awards under the “Shareholder Method,” using a formula designed to preserve the intrinsic value of the awards immediately prior to and subsequent to the Corteva Distribution and moved to the OIP.