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Supplementary Information Other Income (Expense) - Net (Details) - USD ($) $ in Millions | 12 Months Ended
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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.

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