Revenue Disaggregation of Revenue - Principal Product Groups (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Net Sales	$ 4,178	$ 3,956
Seed [Member]
Disaggregation of Revenue [Line Items]
Net Sales	2,492	2,455
Seed [Member] | Corn [Member]
Disaggregation of Revenue [Line Items]
Net Sales	1,888	1,864
Seed [Member] | Soybean [Member]
Disaggregation of Revenue [Line Items]
Net Sales	177	181
Seed [Member] | Other oilseeds [Member]
Disaggregation of Revenue [Line Items]
Net Sales	296	248
Seed [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net Sales	131	162
Crop Protection [Member]
Disaggregation of Revenue [Line Items]
Net Sales	1,686	1,501
Crop Protection [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net Sales	54	71
Crop Protection [Member] | Herbicides [Member]
Disaggregation of Revenue [Line Items]
Net Sales	986	823
Crop Protection [Member] | Insecticides [Member]
Disaggregation of Revenue [Line Items]
Net Sales	385	378
Crop Protection [Member] | Fungicides [Member]
Disaggregation of Revenue [Line Items]
Net Sales	$ 261	$ 229