Restructuring and Asset Related Charges DowDuPont Agriculture Division Restructuring Program (Details) - USD ($) $ in Millions		3 Months Ended																4 Months Ended	8 Months Ended	12 Months Ended		13 Months Ended
		Dec. 31, 2019		Sep. 30, 2019	[1]	Jun. 30, 2019	[1]	Mar. 31, 2019		Dec. 31, 2018		Sep. 30, 2018	[1]	Jun. 30, 2018	[1]	Mar. 31, 2018	[1]	Dec. 31, 2017	Aug. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges (Benefits) - Net		$ 55	[1]	$ 46		$ 60		$ 61	[1]	$ 228	[1]	$ 235		$ 101		$ 130		$ 270	$ 12	$ 222	$ 694
DowDuPont Agriculture Division Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges (Benefits) - Net																				(14)	84	$ 70
Restructuring Reserve, Beginning Balance								77												77
Payments for Restructuring																				(45)
Asset write-offs																				(3)
Separation Adjustment	[2]																			(6)
Restructuring Reserve, Ending Balance		9								77										9	77	9
DowDuPont Agriculture Division Restructuring Program [Member] | Seed [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges (Benefits) - Net																				3	5
DowDuPont Agriculture Division Restructuring Program [Member] | Crop Protection [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges (Benefits) - Net																				(4)	1
DowDuPont Agriculture Division Restructuring Program [Member] | Corporate Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges (Benefits) - Net																				(13)	78
DowDuPont Agriculture Division Restructuring Program [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges (Benefits) - Net																				(17)	78	61
Restructuring Reserve, Beginning Balance								77												77
Payments for Restructuring																				(45)
Asset write-offs																				0
Separation Adjustment	[2]																			(6)
Restructuring Reserve, Ending Balance		9								77										9	77	9
DowDuPont Agriculture Division Restructuring Program [Member] | Asset Related Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges (Benefits) - Net																				3	6	9
Restructuring Reserve, Beginning Balance								$ 0												0
Payments for Restructuring																				0
Asset write-offs																				(3)
Separation Adjustment	[2]																			0
Restructuring Reserve, Ending Balance		$ 0								$ 0										$ 0	$ 0	$ 0

[1] Note 7 - Restructuring and Asset Related Charges - Net, Note 5 - Divestitures and Other Transactions, and Note 15 - Goodwill and Other Intangible Assets, for additional information related to integration and separation costs, restructuring and asset related charges - net, discontinued operations, and goodwill impairment charge, respectively.

[2] Adjustment reflects severance liabilities associated with DAS employees who were terminated by Dow prior to Separation and were recognized within the Consolidated Balance Sheet, as of December 31, 2018, but did not transfer to Corteva as part of the common control combination.