Segment Reporting Segment Reconciliation (Details) - USD ($) $ in Millions		3 Months Ended					9 Months Ended
		Sep. 30, 2019		Mar. 31, 2019	Sep. 30, 2018		Sep. 30, 2019		Sep. 30, 2018
Segment Reporting Information [Line Items]
Loss from Continuing Operations After Taxes		$ (527)		$ (184)	$ (5,642)	[1]	$ (228)	[1]	$ (5,705)	[1]
(Benefit from) provision for income taxes on continuing operations		(104)			(8)		99		(187)
Loss from continuing operations before income taxes		(631)		$ (251)	(5,650)	[1]	(129)	[1]	(5,892)	[1]
Depreciation and Amortization		226			215	[1]	711	[1]	667	[1]
Interest income		13			12		46		63
Interest Expense		19			82		112		251
Exchange (gains) losses - net	[2]	(11)			(74)		(70)		(190)	[3]
Non-operating benefits - net		(32)			(49)	[1]	(106)	[1]	(155)	[1]
Goodwill impairment charge		0			4,503		0		4,503
Significant Items		(246)			(369)		(886)		(876)
Pro forma adjustments	[4]	0			217	[1]	298	[1]	1,695	[1]
Corporate Expenses		31			38	[1]	92	[1]	109	[1]
Segment operating EBITDA		(176)			(213)	[1]	1,855	[1]	2,131	[1]
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Interest income		(13)			(12)	[1]	(46)	[1]	(63)	[1]
Exchange (gains) losses - net		(22)	[5]		74	[1]	37	[1],[5]	140	[1],[5]
Significant Items		246			369	[1]	886	[1]	876	[1]
Hedging Program [Member]
Segment Reporting Information [Line Items]
Exchange (gains) losses - net		55			31		(11)		27	[6]
Hedging Program [Member] | Argentine peso devaluation [Member]
Segment Reporting Information [Line Items]
Exchange (gains) losses - net		(42)			(40)		(33)		(73)
Hedging Program [Member] | Tax Reform Foreign Currency Exchange Impact [Member]
Segment Reporting Information [Line Items]
Exchange (gains) losses - net									(50)
Corporate
Segment Reporting Information [Line Items]
Significant Items	[7]	(185)	[8]		(149)	[9]	(648)	[8],[9],[10]	(585)	[9],[11]
Corporate | Hedging Program [Member] | Argentine peso devaluation [Member]
Segment Reporting Information [Line Items]
Exchange (gains) losses - net		(33)					(33)
Corporate | Hedging Program [Member] | Tax Reform Foreign Currency Exchange Impact [Member]
Segment Reporting Information [Line Items]
Exchange (gains) losses - net									(50)
EID [Member]
Segment Reporting Information [Line Items]
Loss from Continuing Operations After Taxes		(557)			(5,642)		(281)		(5,705)
(Benefit from) provision for income taxes on continuing operations		(113)			(8)		83		(187)
Loss from continuing operations before income taxes		(670)			(5,650)	[12]	(198)	[12]	(5,892)	[12]
Depreciation and Amortization		226			215	[12]	711	[12]	667	[12]
Interest Expense		58			82		181		251
Non-operating benefits - net		(32)			(49)	[12]	(106)	[12]	(155)	[12]
Goodwill impairment charge		0			4,503		0		4,503
Pro forma adjustments	[13]	0			217	[12]	298	[12]	1,695	[12]
Corporate Expenses		31			38	[12]	92	[12]	109	[12]
Segment operating EBITDA		(176)			(213)	[12]	1,855	[12]	2,131	[12]
EID [Member] | Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Interest income		(13)			(12)	[12]	(46)	[12]	(63)	[12]
Exchange (gains) losses - net		(22)	[14]		74	[12]	37	[12],[14]	140	[12],[14]
Significant Items		246			$ 369	[12]	886	[12]	876	[12]
EID [Member] | Hedging Program [Member] | Tax Reform Foreign Currency Exchange Impact [Member]
Segment Reporting Information [Line Items]
Exchange (gains) losses - net									$ (50)
EID [Member] | Corporate | Hedging Program [Member] | Argentine peso devaluation [Member]
Segment Reporting Information [Line Items]
Exchange (gains) losses - net		$ (33)					$ (33)

[1] Periods prior to March 31, 2019 are on a pro forma basis, prepared in accordance with Article 11 of Regulation S-X.

[2] Includes net pre-tax exchange losses of $(33) million and $(42) million for the three and nine months ended September 30, 2019, respectively and $(40) million and $(73) million for the three and nine months ended September 30, 2018, respectively, associated with the devaluation of the Argentine peso.

[3] Includes a $(50) million foreign exchange loss for the nine months ended September 30, 2018 related to adjustments to foreign currency exchange contracts as a result of U.S. tax reform, which is included within significant items.

[4] Refer to page 69 for further details of pro forma adjustments.

[5] Excludes a $(33) million foreign exchange loss for the three and nine months ended September 30, 2019 associated with the devaluation of the Argentine peso and a $(50) million foreign exchange loss for the nine months ended September 30, 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.

[6] Includes a $(50) million foreign exchange loss for the nine months ended September 30, 2018 related to adjustments to foreign currency exchange contracts as a result of U.S. tax reform.

[7] Includes integration and separation costs of $(152) million and $(582) million for the three and nine months ended September 30, 2019. Includes integration costs of $(134) million and $(384) million for the three and nine months ended September 30, 2018, respectively.

[8] Includes a $(33) million charge included in other income - net for the three and nine months ended September 30, 2019 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.

[9] Includes restructuring and asset related charges of $(20) million for the nine months ended September 30, 2019, and $(15) million and $(151) million for the three and nine months ended September 30, 2018, respectively. See Note 7 - Restructuring and Asset Related Charges - Net, for additional information.

[10] Includes a $(13) million loss included in loss on early extinguishment of debt for the nine months ended September 30, 2019 related to the difference between the redemption price and the par value of the Make Whole Notes and Term Loan Facility, partially offset by the write-off of unamortized step-up related to the fair value step-up of EID’s debt.

[11] Includes a $(50) million foreign exchange loss for the nine months ended September 30, 2018 related to adjustments to foreign currency exchange contracts as a result of U.S. tax reform.

[12] Periods prior to March 31, 2019 are on a pro forma basis, prepared in accordance with Article 11 of Regulation S-X.

[13] Refer to page 69 for further details of pro forma adjustments.

[14] Excludes a $(33) million foreign exchange loss for the three and nine months ended September 30, 2019 associated with the devaluation of the Argentine peso and a $(50) million foreign exchange loss for the nine months ended September 30, 2018 related to adjustments to foreign currency exchange contracts as a result of U.S. tax reform, as it is included within significant items. See Note 9 - Supplementary Information of the Corteva, Inc. interim Consolidated Financial Statements for additional information.