Segment Reporting Significant Items (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Restructuring and Asset Related Charges - Net		$ 70	$ 61
Significant Items		123	185	[1]
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Restructuring and Asset Related Charges - Net	[2]	(70)	(61)
Integration costs	[3]		(100)
Significant Items		(123)	(185)
Segment Reconciling Items [Member] | La Porte [Member]
Segment Reporting Information [Line Items]
Loss on Divestiture	[4]	(53)
Segment Reconciling Items [Member] | Sale of JV [Member]
Segment Reporting Information [Line Items]
Loss on Divestiture	[5]		(24)
Segment Reconciling Items [Member] | Seed [Member]
Segment Reporting Information [Line Items]
Restructuring and Asset Related Charges - Net	[2]	(10)	(27)
Significant Items		(10)	(51)
Segment Reconciling Items [Member] | Seed [Member] | Sale of JV [Member]
Segment Reporting Information [Line Items]
Loss on Divestiture	[5]		(24)
Segment Reconciling Items [Member] | Crop Protection [Member]
Segment Reporting Information [Line Items]
Restructuring and Asset Related Charges - Net	[2]	(18)	(23)
Loss on Divestiture	[4]	(53)
Significant Items		(71)	(23)
Segment Reconciling Items [Member] | Crop Protection [Member] | La Porte [Member]
Segment Reporting Information [Line Items]
Loss on Divestiture	[4]	(53)
Segment Reconciling Items [Member] | Corporate
Segment Reporting Information [Line Items]
Restructuring and Asset Related Charges - Net	[2]	(42)	(11)
Integration costs	[3]		(100)
Significant Items		$ (42)	$ (111)

[1] Period is presented on a pro forma basis, prepared in accordance with Article 11 of Regulation S-X.

[2] Includes Board approved restructuring plans and asset related charges as well as accelerated prepaid amortization expense. See Note 5 - Restructuring and Asset Related Charges - Net, for additional information.

[3] Integration costs include costs incurred to prepare for and close the Merger as well as post-Merger integration expenses.

[4] Includes a loss recorded in other income - net related to the expected sale of the La Porte site

[5] Includes a loss recorded in other income - net related to DAS’s sale of a joint venture related to synergy actions.