Segment Reporting Segment Information (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2020		Jun. 30, 2019		Jun. 30, 2020		Jun. 30, 2019		Dec. 31, 2019
Segment Reporting Information [Line Items]
Net Sales	$ 5,191		$ 5,556		$ 9,147		$ 8,952
Segment operating EBITDA	1,265		1,486		2,084		2,031	[1]
Segment Assets	37,390		39,828		37,390		39,828		$ 38,879
Seed [Member]
Segment Reporting Information [Line Items]
Net Sales	3,538		3,699		5,993		5,666
Segment operating EBITDA	956		1,036		1,537		1,361
Segment Assets	24,356	[2]	26,623	[2]	24,356	[2]	26,623	[2]	25,387
Crop Protection [Member]
Segment Reporting Information [Line Items]
Net Sales	1,653		1,857		3,154		3,286
Segment operating EBITDA	309		450		547		670
Segment Assets	$ 13,034	[2]	$ 13,205	[2]	$ 13,034	[2]	$ 13,205	[2]	$ 13,492

[1] Period is presented on a pro forma basis, prepared in accordance with Article 11 of Regulation S-X.

[2] Segment assets at December 31, 2019 were $25,387 million and $13,492 million for Seed and Crop Protection, respectively.