EID Segment FN Segment Reconciliation (Details) - USD ($) $ in Millions		3 Months Ended																4 Months Ended	8 Months Ended	12 Months Ended
		Dec. 31, 2019		Sep. 30, 2019		Jun. 30, 2019		Mar. 31, 2019		Dec. 31, 2018		Sep. 30, 2018		Jun. 30, 2018		Mar. 31, 2018		Dec. 31, 2017	Aug. 31, 2017	Dec. 31, 2019		Dec. 31, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations After Taxes		$ (42)	[1]	$ (527)	[2],[3]	$ 483	[4]	$ (184)	[5]	$ (1,070)	[4],[5],[6]	$ (5,642)	[6],[7]	$ 375	[6],[8]	$ (438)	[6],[9]	$ 1,760	$ 358	$ (270)		$ (6,775)
Benefit from income taxes on continuing operations																		(2,221)	(395)	(46)		(31)
Loss from Continuing Operations before Income Taxes																		(461)	(37)	(316)		(6,806)
Depreciation and Amortization																				1,599		2,790
Interest income																		50	59	59		86
Interest Expense																		115	254	136		337
Net exchange losses																		(23)	(364)	(99)	[10],[11]	(127)	[10],[11],[12],[13]
Non-operating benefits - net																				(129)		(211)
Goodwill Impairment Charge										$ 0		$ 4,503	[14]	$ 0		0		0	0	0		4,503
Significant items																				991		1,346
Pro forma adjustments																				298		2,003
Corporate Expenses																				119		141
Pro forma Segment Operating EBITDA	[15]																			2,106		2,213
Hedging Program [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net exchange losses																		91	(431)	(58)		94	[13]
Hedging Program [Member] | Argentine peso devaluation [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net exchange losses				(33)																(51)		(68)
Hedging Program [Member] | Tax Reform Foreign Currency Exchange Impact [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net exchange losses																$ (50)						(50)
Segment Reconciling Items [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Interest income																				(59)		(86)
Net exchange losses	[16]																			66		77
Significant items																				(991)		(1,346)
Segment Reconciling Items [Member] | Hedging Program [Member] | Argentine peso devaluation [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net exchange losses	[17]																			(33)
Segment Reconciling Items [Member] | Hedging Program [Member] | Tax Reform Foreign Currency Exchange Impact [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net exchange losses	[18]																					(50)
EID [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations After Taxes		$ (70)		$ (557)		$ 460		$ (184)										1,760	358	(351)		(6,775)
Benefit from income taxes on continuing operations																		(2,221)	(395)	(71)		(31)
Loss from Continuing Operations before Income Taxes																		(461)	(37)	(422)		(6,806)
Depreciation and Amortization																				1,000		909
Interest Expense																		115	254	242		337
Non-operating benefits - net																				(129)		(211)
Goodwill Impairment Charge																		$ 0	$ 0	0		4,503
Pro forma adjustments																				298		2,003
Corporate Expenses																				119		141
Pro forma Segment Operating EBITDA	[19]																			2,106		2,213
EID [Member] | Hedging Program [Member] | Argentine peso devaluation [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net exchange losses																				(33)
EID [Member] | Hedging Program [Member] | Tax Reform Foreign Currency Exchange Impact [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net exchange losses																						(50)
EID [Member] | Segment Reconciling Items [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Interest income																				(59)		(86)
Net exchange losses	[20]																			66		77
Significant items																				$ 991		$ 1,346

[1] Fourth quarter 2019 includes a tax benefit of $34 million related to the impact of the release of a tax valuation allowance recorded against the net deferred tax asset position of a Switzerland legal entity. See Note 10 - Income Taxes, for additional information.

[2] Third quarter 2019 includes a $(33) million 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. 

[3] Third quarter 2019 includes a tax benefit of $38 million related to Swiss Tax Reform. See Note 10 - Income Taxes, for additional information.

[4] Includes a loss on early extinguishment of debt of $(13) million in the second quarter of 2019 and $(81) million in the fourth quarter 2018 related to the retirement of some of the company's debt. See Note 17 - Short-Term Borrowings, Long-Term Debt and Available Credit Facilities, for additional information.

[5] First quarter 2019 includes a $(24) million loss recorded in other income (expense) - net related to Historical Dow’s sale of a joint venture related to synergy actions. Fourth quarter 2018 includes a $(53) million loss recorded in other income (expense) - net related to the deconsolidation of a subsidiary.

[6] Includes tax (charges) benefits of $(64) million, $(7) million, $16 million, and $(274) million in the first quarter 2018, second quarter 2018, third quarter 2018, and fourth quarter 2018, respectively, related to The Act. See Note 10 - Income Taxes, for additional information.

[7] Includes a tax charge of $(75) million in the third quarter 2018 related to the establishment of a full valuation allowance against the net deferred tax asset position of a legal entity in Brazil, a tax charge of $(25) million related to an internal legal entity restructuring associated with the Business Separations, and a tax benefit of $114 million related to the company's discretionary pension contribution in 2018 which was deducted on a 2017 tax return. See Note 10 - Income Taxes, for additional information.

[8] Second quarter 2018 includes a $24 million gain recorded in other income (expense) - net related to an asset sale.

[9] First quarter 2018 includes a $(50) million foreign exchange loss related to adjustments to foreign currency exchange contracts as a result of U.S. tax reform.

[10] 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.

[11] 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.

[12] 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.

[13] 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.

[14] 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.

[15] Segment operating EBITDA for all periods is presented on a pro forma basis, prepared in accordance with Article 11 of Regulation S-X.

[16] 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.

[17] 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.

[18] 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.

[19] Segment operating EBITDA for all periods is presented on a pro forma basis, prepared in accordance with Article 11 of Regulation S-X.

[20] 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, of the Corteva, Inc. Consolidated Financial Statements for additional information.