Revenue Disaggregation of Revenue - Principal Product Groups (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Net Sales	$ 2,371	$ 1,863	$ 12,176	$ 11,010
Seed [Member]
Disaggregation of Revenue [Line Items]
Net Sales	738	523	7,010	6,516
Seed [Member] | Corn [Member]
Disaggregation of Revenue [Line Items]
Net Sales	437	303	4,505	4,224
Seed [Member] | Soybean [Member]
Disaggregation of Revenue [Line Items]
Net Sales	157	116	1,494	1,382
Seed [Member] | Other oilseeds [Member]
Disaggregation of Revenue [Line Items]
Net Sales	94	62	661	529
Seed [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net Sales	50	42	350	381
Crop Protection [Member]
Disaggregation of Revenue [Line Items]
Net Sales	1,633	1,340	5,166	4,494
Crop Protection [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net Sales	96	101	257	247
Crop Protection [Member] | Herbicides [Member]
Disaggregation of Revenue [Line Items]
Net Sales	782	583	2,737	2,315
Crop Protection [Member] | Insecticides [Member]
Disaggregation of Revenue [Line Items]
Net Sales	416	395	1,261	1,218
Crop Protection [Member] | Fungicides [Member]
Disaggregation of Revenue [Line Items]
Net Sales	$ 339	$ 261	$ 911	$ 714