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Revenue Disaggregation of Revenue - Principal Product Groups (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Net Sales	$ 5,627	$ 5,191	$ 9,805	$ 9,147
Seed [Member]
Disaggregation of Revenue [Line Items]
Net Sales	3,780	3,538	6,272	5,993
Seed [Member] | Corn [Member]
Disaggregation of Revenue [Line Items]
Net Sales	2,180	2,057	4,068	3,921
Seed [Member] | Soybean [Member]
Disaggregation of Revenue [Line Items]
Net Sales	1,160	1,085	1,337	1,266
Seed [Member] | Other oilseeds [Member]
Disaggregation of Revenue [Line Items]
Net Sales	271	219	567	467
Seed [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net Sales	169	177	300	339
Crop Protection [Member]
Disaggregation of Revenue [Line Items]
Net Sales	1,847	1,653	3,533	3,154
Crop Protection [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net Sales	107	75	161	146
Crop Protection [Member] | Herbicides [Member]
Disaggregation of Revenue [Line Items]
Net Sales	969	909	1,955	1,732
Crop Protection [Member] | Insecticides [Member]
Disaggregation of Revenue [Line Items]
Net Sales	460	445	845	823
Crop Protection [Member] | Fungicides [Member]
Disaggregation of Revenue [Line Items]
Net Sales	$ 311	$ 224	$ 572	$ 453

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