EID Related Party (Notes)	12 Months Ended
EID Related Party (Notes)	Dec. 31, 2020
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 reported transactions with Historical Dow and its affiliates as related party transactions. Purchases from Historical Dow and its affiliates were $42 million, and $149 million for the years ended December 31, 2019 and 2018, respectively. 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 DowDuPont 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, EID declared and paid distributions in cash to DowDuPont of about $2,806 million 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 - Long-Term Debt and Available Credit Facilities, to the Consolidated Financial Statements, 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.
EID [Member]
Related Party Transaction [Line Items]
Related Party Transactions Disclosure [Text Block]	RELATED PARTY TRANSACTIONS Refer to page F-32 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, 2020 and December 31, 2019, the outstanding related party loan balance was $3,459 million and $4,021 million respectively (which approximates fair value), with interest rates of 1.62% and 3.27%, respectively, and is reflected as long-term debt - related party on EID's Consolidated Balance Sheet. Additionally, EID has incurred tax deductible interest expense of $100 million and $106 million and paid interest of $105 million and $100 million for the years ended December 31, 2020 and 2019, respectively, associated with the related party loan to Corteva, Inc. As of December 31, 2020, EID had payables to Corteva, Inc. of $92 million included in both accrued and other current liabilities and other noncurrent obligations, respectively, and $119 million and $154 million at December 31, 2019 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-23 of the Corteva, Inc. Consolidated Financial Statements for further details of the Separation Agreements).