Segment Reporting Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021		Mar. 31, 2020		Dec. 31, 2020
Segment Reporting Information [Line Items]
Net Sales	$ 4,178		$ 3,956
Segment operating EBITDA	938		819
Segment Assets	38,148		39,108		$ 36,850
Seed [Member]
Segment Reporting Information [Line Items]
Net Sales	2,492		2,455
Segment operating EBITDA	617		581
Segment Assets	24,799	[1]	25,857	[1]	23,751
Crop Protection [Member]
Segment Reporting Information [Line Items]
Net Sales	1,686		1,501
Segment operating EBITDA	321		238
Segment Assets	$ 13,349	[1]	$ 13,251	[1]	$ 13,099

[1] Segment assets at December 31, 2020 were $23,751 million and $13,099 million for Seed and Crop Protection, respectively.