Restructuring and Asset Related Charges Execute to Win Productivity Program (Details) - USD ($) $ in Millions	3 Months Ended																12 Months Ended
	Dec. 31, 2020		Sep. 30, 2020	[1]	Jun. 30, 2020	[1]	Mar. 31, 2020	[1]	Dec. 31, 2019		Sep. 30, 2019	[1]	Jun. 30, 2019	[1]	Mar. 31, 2019	[1]	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Feb. 01, 2021
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges- net	$ 37	[1]	$ 49		$ 179		$ 70		$ 55	[1]	$ 46		$ 60		$ 61		$ 335	$ 222	$ 694
Asset Related Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges- net																	176
Execute to Win Productivity Program
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	56								0								56	0
Asset Retirement Obligation	21																21
Restructuring and asset related charges- net																	176
Payments for Restructuring																	(15)
Asset write-offs																	(105)
Execute to Win Productivity Program | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Future Cash Payments	77																77
Restructuring Reserve	53								0								53	0
Restructuring and asset related charges- net																	63
Payments for Restructuring																	(10)
Asset write-offs																	0
Execute to Win Productivity Program | Asset Related Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 3								$ 0								3	$ 0
Restructuring and asset related charges- net																	113
Payments for Restructuring																	(5)
Asset write-offs																	(105)
Execute to Win Productivity Program | Crop Protection [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges- net																	98
Execute to Win Productivity Program | Seed [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges- net																	15
Execute to Win Productivity Program | Corporate, Non-Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges- net																	$ 63
Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost																				$ 130
Future Cash Payments																				90
Minimum [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost																				40
Minimum [Member] | Asset Related Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost																				40
Minimum [Member] | Asset Retirement Obligation Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost																				10
Minimum [Member] | Execute to Win Productivity Program
Restructuring Cost and Reserve [Line Items]
Required Time to Remove Assets																	12 months
Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost																				170
Future Cash Payments																				110
Maximum [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost																				50
Maximum [Member] | Asset Related Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost																				60
Maximum [Member] | Asset Retirement Obligation Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost																				$ 15
Maximum [Member] | Execute to Win Productivity Program
Restructuring Cost and Reserve [Line Items]
Required Time to Remove Assets																	24 months

[1] See Note 2 - Summary of Significant Accounting Polices, Note 7 - Restructuring and Asset Related Charges - Net, Note 5 - Divestitures and Other Transactions, and Note 15 - Goodwill and Other Intangible Assets, to the Consolidated Financial Statements for additional information related to integration and separation costs, restructuring and asset related charges - net, and discontinued operations, respectively.