Revenue Disaggregation of Revenue - Geography (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Net Sales		$ 1,863	$ 1,911	$ 11,010	$ 10,863
Seed [Member]
Disaggregation of Revenue [Line Items]
Net Sales		523	681	6,516	6,347
Seed [Member] | North America
Disaggregation of Revenue [Line Items]
Net Sales	[1]	97	226	4,290	4,238
Seed [Member] | EMEA
Disaggregation of Revenue [Line Items]
Net Sales	[2]	117	122	1,262	1,200
Seed [Member] | Latin America
Disaggregation of Revenue [Line Items]
Net Sales		246	271	668	636
Seed [Member] | Asia Pacific
Disaggregation of Revenue [Line Items]
Net Sales		63	62	296	273
Crop Protection [Member]
Disaggregation of Revenue [Line Items]
Net Sales		1,340	1,230	4,494	4,516
Crop Protection [Member] | North America
Disaggregation of Revenue [Line Items]
Net Sales	[1]	390	397	1,528	1,562
Crop Protection [Member] | EMEA
Disaggregation of Revenue [Line Items]
Net Sales	[2]	198	183	1,163	1,136
Crop Protection [Member] | Latin America
Disaggregation of Revenue [Line Items]
Net Sales		559	491	1,086	1,144
Crop Protection [Member] | Asia Pacific
Disaggregation of Revenue [Line Items]
Net Sales		$ 193	$ 159	$ 717	$ 674

[1] Represents U.S. & Canada.

[2] Europe, Middle East, and Africa ("EMEA").