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Revenue Disaggregation of Revenue - Products (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Net Sales		$ 3,207	$ 1,863	$ 5,191	$ 3,956	$ 2,983	$ 1,911	$ 5,556	$ 3,396	$ 14,217	$ 13,846	$ 14,287
Seed [Member]
Disaggregation of Revenue [Line Items]
Net Sales										7,756	7,590	7,842
Seed [Member] | Corn [Member]
Disaggregation of Revenue [Line Items]
Net Sales	[1]									5,182	5,126	5,220
Seed [Member] | Soybean [Member]
Disaggregation of Revenue [Line Items]
Net Sales	[1]									1,445	1,387	1,497
Seed [Member] | Other oilseeds [Member]
Disaggregation of Revenue [Line Items]
Net Sales	[1]									619	593	645
Seed [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net Sales	[1]									510	484	480
Crop Protection [Member]
Disaggregation of Revenue [Line Items]
Net Sales										6,461	6,256	6,445
Crop Protection [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net Sales	[1]									385	326	384
Crop Protection [Member] | Herbicides [Member]
Disaggregation of Revenue [Line Items]
Net Sales	[1]									3,280	3,206	3,413
Crop Protection [Member] | Insecticides [Member]
Disaggregation of Revenue [Line Items]
Net Sales	[1]									1,764	1,652	1,506
Crop Protection [Member] | Fungicides [Member]
Disaggregation of Revenue [Line Items]
Net Sales	[1]									$ 1,032	$ 1,072	$ 1,142
[1] Prior periods have been reclassified to conform to current period presentation.

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