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Quaterly Financial Data
 12 Months Ended
Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information [Text Block] QUARTERLY FINANCIAL DATA (UNAUDITED)
For the Quarter Ended
In millions, except per share amounts March 31,June 30,September 30,December 31,
2020
Net sales$3,956 $5,191 $1,863 $3,207 
Cost of goods sold2,269 2,829 1,297 2,112 
Restructuring and asset related charges - net1
70 179 49 37 
Income (loss) from continuing operations after income taxes281 3,4766 5(390)99 6
Net income (loss) attributable to Corteva1
272 760 (392)41 
Earnings (loss) per common share, continuing operations - basic2
0.36 1.01 (0.52)0.13 
Earnings (loss) per common share, continuing operations - diluted2
0.36 1.01 (0.52)0.13 
2019
Net sales$3,396 $5,556 $1,911 $2,983 
Cost of goods sold7
2,211 3,047 1,349 1,968 
Restructuring and asset related charges - net1
61 60 46 55 
Integration and separation costs1
212 330 152 50 
(Loss) income from continuing operations after income taxes(184)8483 9(527)10, 11(42)12
Net income (loss) attributable to Corteva1
164 (608)(494)(21)
(Loss) earnings per common share, continuing operations - basic2
(0.26)0.63 (0.69)(0.06)
(Loss) earnings per common share, continuing operations - diluted2
(0.26)0.63 (0.69)(0.06)
1.See Note 2 - Summary of Significant Accounting Polices, Note 7 - Restructuring and Asset Related Charges - Net, Note 5 - Divestitures and Other Transactions, and Note 15 - Goodwill and Other Intangible Assets, to the Consolidated Financial Statements for additional information related to integration and separation costs, restructuring and asset related charges - net, and discontinued operations, respectively.
2.Earnings per share for the year may not equal the sum of quarterly earnings per share due to rounding and the changes in average share calculations.
3.First quarter 2020 includes a loss of $(53) million recorded in other income - net related to the expected sale of the La Porte site, for which the company signed an agreement during the first quarter 2020.
4.First quarter 2020 includes a $19 million after tax charge related to the impact of a state tax valuation allowance in the U.S. based on a change in judgment about the realizability of a deferred tax asset. See Note 10 - Income Taxes, to the Consolidated Financial Statements, for additional information.
5.Second quarter 2020 includes an after-tax benefit of $(29) million due to an elective change in accounting method that alters the 2019 impact of the business separation on the 2017 Tax Cuts and Jobs Act's foreign tax provision. See Note 10 - Income Taxes, to the Consolidated Financial Statements for additional information.
6.Fourth quarter 2020 includes an after-tax benefit of $(182) million related to Swiss Tax Reform. See Note 10 - Income Taxes, to the Consolidated Financial Statements, for additional information.
7.Includes charges of $205 million, $52 million, and $15 million for the first quarter 2019, second quarter 2019, and third quarter 2019, respectively, related to the amortization of inventory step-up as a result of the Merger.
8.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.
9.Includes a loss on early extinguishment of debt of $(13) million in the second quarter of 2019 related to the retirement of some of the company's debt. See Note 17 - Long-Term Debt and Available Credit Facilities, to the Consolidated Financial Statements for additional information.
10.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. 
11.Third quarter 2019 includes a tax benefit of $(38) million related to Swiss Tax Reform. See Note 10 - Income Taxes, to the Consolidated Financial Statements for additional information.
12.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, to the Consolidated Financial Statements for additional information.