EID Related Party (Notes)	12 Months Ended
EID Related Party (Notes)	Dec. 31, 2019
Related Party Transaction [Line Items]
Related Party Transactions Disclosure [Text Block]	RELATED PARTY TRANSACTIONS Services Provided by and to Historical Dow and its affiliates Following the Merger and prior to the Dow Distribution, Corteva reports transactions with Historical Dow and its affiliates as related party transactions. At December 31, 2018 there was $110 million due to Historical Dow and its affiliates, reflected in liabilities from discontinued operations - current. Purchases from Historical Dow and its affiliates were $42 million, $149 million, and $42 million for the year ended December 31, 2019, the year ended December 31, 2018, and the period September 1 through December 31, 2017. Transactions with DowDuPont In November 2017, DowDuPont's Board of Directors authorized an initial $4,000 million share repurchase program to buy back shares of DowDuPont common stock. The $4,000 million share repurchase program was completed in the third quarter of 2018. In February, May, August and November 2018, the Board declared first, second, third and fourth quarter dividends per share of DowDuPont common stock payable on March 15, 2018, June 15, 2018, September 15, 2018 and December 14, 2018, respectively. For the year ended December 31, 2018 and the period September 1 through December 31, 2017, EID declared and paid distributions in cash to DowDuPont of about $2,806 million and $829 million, respectively, primarily to fund a portion of DowDuPont’s share repurchases and dividend payments for these periods. In addition, in 2019 and 2018, DowDuPont contributed cash to Corteva to fund portions of the company's debt redemption/repayment transactions. See Note 17 - Short-Term Borrowings, Long-Term Debt and Available Credit Facilities, for additional information. In February 2019, the DowDuPont Board declared first quarter dividends per share of DowDuPont common stock payable on March 15, 2019. EID declared and paid distributions to DowDuPont of about $317 million for the year ended December 31, 2019 to fund a portion of DowDuPont’s dividend payments. In addition, at December 31, 2018 EID had a payable to DowDuPont of $103 million included in accounts payable in the Consolidated Balance Sheets related to its estimated tax liability for the period beginning with the Merger through the date of the Dow Distribution, during which time the parties filed a consolidated US tax return. See Note 10 - Income Taxes, for additional information.
EID [Member]
Related Party Transaction [Line Items]
Related Party Transactions Disclosure [Text Block]	RELATED PARTY TRANSACTIONS Refer to page F-40 of the Corteva, Inc. Consolidated Financial Statements for discussion of related party transactions with Historical Dow and DowDuPont. Transactions with Corteva In the second quarter of 2019, EID entered into a related party revolving loan from Corteva, Inc., with a maturity date in 2024. As of December 31, 2019, the outstanding related party loan balance was $4,021 million (which approximates fair value) with an interest rate of 3.27%, and is reflected as long-term debt - related party on EID's Consolidated Balance Sheet. Additionally, EID has incurred tax deductible interest expense of $106 million for the year ended December 31, 2019 associated with the related party loan to Corteva, Inc. As of December 31, 2019, EID had payables to Corteva, Inc., the parent company, of $119 million and $154 million included in accrued and other current liabilities and other noncurrent obligations, respectively, in the Consolidated Balance Sheet related to Corteva's indemnification liabilities to Dow and DuPont per the Separation Agreements (refer to page F-28 of the Corteva, Inc. Consolidated Financial Statements for further details of the Separation Agreements).