Supplementary Information Other Income (Expense) - Net (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Sundry Income (Expense) - Net [Line Items]
Interest income		$ 56	$ 59	$ 86
Equity in losses of affiliates - net		0	(9)	(1)
Net gain on sales of businesses and other assets	[1]	(2)	64	62
Net exchange losses	[2],[3]	(174)	(99)	(127)
Non-operating pension and other post employment benefit credit (cost)	[4]	368	191	275
Miscellaneous income (expenses) - net	[5]	(36)	9	(46)
Other income (expense) - net		212	215	249
Segment Reconciling Items [Member]
Schedule of Sundry Income (Expense) - Net [Line Items]
Interest income		(56)	(59)	(86)
Net exchange losses	[6]	174	66	77
Non-operating pension and other post employment benefit credit (cost)		(316)	(129)	(211)
(Loss) Gain on sale or disposition of assets	[7],[8]		(24)
Deconsolidation of a subsidiary [Member] | Segment Reconciling Items [Member]
Schedule of Sundry Income (Expense) - Net [Line Items]
(Loss) Gain on sale or disposition of assets	[8],[9]			(53)
La Porte | Segment Reconciling Items [Member]
Schedule of Sundry Income (Expense) - Net [Line Items]
(Loss) Gain on sale or disposition of assets	[10]	(53)
La Porte | Segment Reconciling Items [Member] | Crop Protection [Member]
Schedule of Sundry Income (Expense) - Net [Line Items]
(Loss) Gain on sale or disposition of assets	[10]	(53)
APAC Business [Member] | Segment Reconciling Items [Member] | Crop Protection [Member]
Schedule of Sundry Income (Expense) - Net [Line Items]
(Loss) Gain on sale or disposition of assets		27
Hedging Program [Member]
Schedule of Sundry Income (Expense) - Net [Line Items]
Net exchange losses		89	(58)	94
Hedging Program [Member] | Argentine peso devaluation [Member]
Schedule of Sundry Income (Expense) - Net [Line Items]
Net exchange losses		$ (82)	(51)	(68)
Hedging Program [Member] | Argentine peso devaluation [Member] | Segment Reconciling Items [Member]
Schedule of Sundry Income (Expense) - Net [Line Items]
Net exchange losses			$ (33)
Hedging Program [Member] | Tax Reform Foreign Currency Exchange Impact [Member]
Schedule of Sundry Income (Expense) - Net [Line Items]
Net exchange losses				(50)
Hedging Program [Member] | Tax Reform Foreign Currency Exchange Impact [Member] | Segment Reconciling Items [Member]
Schedule of Sundry Income (Expense) - Net [Line Items]
Net exchange losses	[8],[11]			$ (50)

[1] The year ended December 31, 2020 includes a loss of $(53) million and a gain of $27 million relating to the expected sale of the La Porte site, for which the company signed an agreement in 2020, and the sale of a business in Asia Pacific in the crop protection segment, respectively.

[2] Includes a $(50) million foreign exchange loss for the year ended December 31, 2018 related to adjustments to foreign currency exchange contracts as a result of U.S. tax reform, which is included within significant items.

[3] Includes net pre-tax exchange losses of $(82) million, $(51) million and $(68) million associated with the devaluation of the Argentine peso for the years ended December 31, 2020, 2019 and 2018, respectively.

[4] Includes non-service related components of net periodic benefit credits (costs) (interest cost, expected return on plan assets, amortization of unrecognized (gain) loss, amortization of prior service benefit and settlement (loss) gain). 

[5] Miscellaneous (expenses) income - net, includes losses from sale of receivables, tax indemnification adjustments related to changes in indemnification balances as a result of the application of the terms of the Tax Matters Agreement, between Corteva and Dow and/or DuPont, and other items. In addition, the year ended December 31, 2018 includes a $(53) million loss related to the deconsolidation of a subsidiary (refer to Note 25 - Segment Information). Refer to Note 12 - Accounts and Notes Receivable - Net, for additional information on losses on the sale of receivables.

[6] Excludes a $(33) million foreign exchange loss for the year ended December 31, 2019 associated with the devaluation of the Argentine peso and a $(50) million foreign exchange loss for the year ended December 31, 2018 related to adjustments to foreign currency exchange contracts as a result of U.S. tax reform, as they are included within significant items. See Note 9 - Supplementary Information, to the Consolidated Financial Statements, for additional information.

[7] Includes a loss recorded in other income - net related to DAS's sale of a joint venture related to synergy actions.

[8] The years ended December 31, 2019 and December 31, 2018 are presented on a pro forma basis, prepared in accordance with Article 11 of Regulation S-X that was in effect prior to recent amendments.

[9] Includes a loss recorded in other income (expense) - net related to the deconsolidation of a subsidiary.

[10] Includes a loss recorded in other income - net related to the expected sale of the La Porte site.

[11] Includes a foreign exchange loss recorded in other income (expense) - net related to adjustments to foreign currency exchange contracts as a result of U.S. tax reform.