Revenue Disaggregation of Revenue - Geography (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Net Sales		$ 5,191	$ 5,556	$ 9,147	$ 8,952
Seed [Member]
Disaggregation of Revenue [Line Items]
Net Sales		3,538	3,699	5,993	5,666
Seed [Member] | North America
Disaggregation of Revenue [Line Items]
Net Sales	[1]	2,903	3,099	4,193	4,012
Seed [Member] | EMEA
Disaggregation of Revenue [Line Items]
Net Sales	[2]	264	274	1,145	1,078
Seed [Member] | Latin America
Disaggregation of Revenue [Line Items]
Net Sales		206	187	422	365
Seed [Member] | Asia Pacific
Disaggregation of Revenue [Line Items]
Net Sales		165	139	233	211
Crop Protection [Member]
Disaggregation of Revenue [Line Items]
Net Sales		1,653	1,857	3,154	3,286
Crop Protection [Member] | North America
Disaggregation of Revenue [Line Items]
Net Sales	[1]	663	686	1,138	1,165
Crop Protection [Member] | EMEA
Disaggregation of Revenue [Line Items]
Net Sales	[2]	379	393	965	953
Crop Protection [Member] | Latin America
Disaggregation of Revenue [Line Items]
Net Sales		309	466	527	653
Crop Protection [Member] | Asia Pacific
Disaggregation of Revenue [Line Items]
Net Sales		$ 302	$ 312	$ 524	$ 515

[1] Represents U.S. & Canada.

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