Revenue Disaggregation of Revenue - Principal Product Groups (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] | Corn [Member]
Disaggregation of Revenue [Line Items]
Net Sales	1,864	1,468
Seed [Member] | Soybean [Member]
Disaggregation of Revenue [Line Items]
Net Sales	181	131
Seed [Member] | Other oilseeds [Member]
Disaggregation of Revenue [Line Items]
Net Sales	248	225
Seed [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net Sales	162	143
Crop Protection [Member]
Disaggregation of Revenue [Line Items]
Net Sales	1,501	1,429
Crop Protection [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net Sales	71	61
Crop Protection [Member] | Herbicides [Member]
Disaggregation of Revenue [Line Items]
Net Sales	823	771
Crop Protection [Member] | Insecticides [Member]
Disaggregation of Revenue [Line Items]
Net Sales	378	377
Crop Protection [Member] | Fungicides [Member]
Disaggregation of Revenue [Line Items]
Net Sales	$ 229	$ 220