Revenue Disaggregation of Revenue - Geography (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Net Sales		$ 3,956	$ 3,396
Seed [Member]
Disaggregation of Revenue [Line Items]
Net Sales		2,455	1,967
Seed [Member] | North America
Disaggregation of Revenue [Line Items]
Net Sales	[1]	1,290	913
Seed [Member] | EMEA
Disaggregation of Revenue [Line Items]
Net Sales	[2]	881	804
Seed [Member] | Latin America
Disaggregation of Revenue [Line Items]
Net Sales		216	178
Seed [Member] | Asia Pacific
Disaggregation of Revenue [Line Items]
Net Sales		68	72
Crop Protection [Member]
Disaggregation of Revenue [Line Items]
Net Sales		1,501	1,429
Crop Protection [Member] | North America
Disaggregation of Revenue [Line Items]
Net Sales	[1]	475	479
Crop Protection [Member] | EMEA
Disaggregation of Revenue [Line Items]
Net Sales	[2]	586	560
Crop Protection [Member] | Latin America
Disaggregation of Revenue [Line Items]
Net Sales		218	187
Crop Protection [Member] | Asia Pacific
Disaggregation of Revenue [Line Items]
Net Sales		$ 222	$ 203

[1] Represents U.S. & Canada.

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