Segment Reporting Significant Items (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Restructuring and Asset related charges, net		$ 26	$ 49	$ 261	$ 298
Significant Items		(21)	49	214	351
Net exchange gains (losses)	[1]	2	(67)	(47)	(127)
Hedging Program [Member]
Segment Reporting Information [Line Items]
Net exchange gains (losses)		34	(6)	0	173
Argentine Peso Devaluation [Member] | Hedging Program [Member]
Segment Reporting Information [Line Items]
Net exchange gains (losses)		(16)	(26)	(53)	(56)
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Restructuring and Asset related charges, net	[2]	(26)	(49)	(261)	(298)
Equity securities mark-to-market gain		47		47
Loss on Divestiture	[3]				(53)
Significant Items		21	(49)	(214)	(351)
Net exchange gains (losses)		(2)	67	47	127
Segment Reconciling Items [Member] | Seed [Member]
Segment Reporting Information [Line Items]
Restructuring and Asset related charges, net	[2]	(9)	(9)	(145)	(154)
Equity securities mark-to-market gain		47		47
Significant Items		38	(9)	(98)	(154)
Segment Reconciling Items [Member] | Crop Protection [Member]
Segment Reporting Information [Line Items]
Restructuring and Asset related charges, net	[2]	(8)	(40)	(51)	(98)
Equity securities mark-to-market gain		0		0
Loss on Divestiture					(53)
Significant Items		(8)	(40)	(51)	(151)
Segment Reconciling Items [Member] | Crop Protection [Member] | Sale of JV [Member]
Segment Reporting Information [Line Items]
Loss on Divestiture	[3]				(53)
Segment Reconciling Items [Member] | Corporate
Segment Reporting Information [Line Items]
Restructuring and Asset related charges, net	[2]	(9)	0	(65)	(46)
Equity securities mark-to-market gain		0		0
Significant Items		$ (9)	$ 0	$ (65)	$ (46)

[1] Includes net pre-tax exchange losses of $(16) million and $(53) million associated with the devaluation of the Argentine peso for the three and nine months ended September 30, 2021, respectively, and $(26) million and $(56) million for the three and nine months ended September 30, 2020, respectively.

[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, to the interim Consolidated Financial Statements for additional information.

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