Supplementary Information Other Income (Expense) - Net (Details) - USD ($) $ in Millions		3 Months Ended			4 Months Ended		8 Months Ended	12 Months Ended
		Sep. 30, 2019	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017		Aug. 31, 2017	Dec. 31, 2019		Dec. 31, 2018
Schedule of Sundry Income (Expense) - Net [Line Items]
Royalty Income	[1]						$ 60
Interest income					$ 50		59	$ 59		$ 86
Equity in losses of affiliates - net					(3)		(7)	(9)		(1)
Net gain on sales of businesses and other assets					689	[2]	10	64		62
Net exchange losses					(23)		(364)	(99)	[3],[4]	(127)	[3],[4],[5],[6]
Non-operating pension and other post employment benefit credit (cost)	[7]				103		(296)	191		275
Miscellaneous income (expenses) - net	[8]				(11)		37	9		(46)
Other income (expense) - net					805		(501)	215		249
(Loss) Gain on sale or disposition of assets			$ 24
DAS Divested Ag Business [Member] [Member]
Schedule of Sundry Income (Expense) - Net [Line Items]
Pre-tax gain on disposal					671
Segment Reconciling Items [Member]
Schedule of Sundry Income (Expense) - Net [Line Items]
Interest income								(59)		(86)
Net exchange losses	[9]							66		77
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	[10]									(53)
Hedging Program [Member]
Schedule of Sundry Income (Expense) - Net [Line Items]
Net exchange losses					$ 91		$ (431)	(58)		94	[6]
Hedging Program [Member] | Argentine peso devaluation [Member]
Schedule of Sundry Income (Expense) - Net [Line Items]
Net exchange losses		$ (33)						(51)		(68)
Hedging Program [Member] | Argentine peso devaluation [Member] | Segment Reconciling Items [Member]
Schedule of Sundry Income (Expense) - Net [Line Items]
Net exchange losses	[11]							$ (33)
Hedging Program [Member] | Tax Reform Foreign Currency Exchange Impact [Member]
Schedule of Sundry Income (Expense) - Net [Line Items]
Net exchange losses				$ (50)						(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	[12]									$ (50)

[1] In the Successor periods, royalty income is included in net sales.

[2] Includes a $671 million gain on the sale of assets for the period September 1 through December 31, 2017 related to the divestiture of the DAS Divested Ag Business. Refer to Note 5 - Divestitures and Other Transactions, for additional information.

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

[4] Includes a net $(51) million and $(68) million pre-tax exchange loss associated with the devaluation of the Argentine peso for the year ended December 31, 2019 and December 31, 2018, respectively.

[5] 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.

[6] 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.

[7] 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 curtailment/settlement gain). The company adopted ASU No. 2017-07, Compensation - Retirement Benefits (Topic 715) on January 1, 2018, retrospectively, and recorded the other components of net periodic benefit cost in other income (expense) - net.

[8] Miscellaneous income (expenses) - 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.

[9] 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, for additional information.

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

[11] Includes a charge included in other income (expense) - net associated with remeasuring the company’s Argentine Peso net monetary assets, resulting from an unexpected August primary election result in Argentina.  Throughout the three months ended September 30, 2019, the Argentine Peso dropped approximately a third of its value against the US dollar and in September of 2019, the country’s central bank announced new restrictions on foreign currency transactions.

[12] 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.