EID - Related Party Transactions (Notes)	9 Months Ended
EID - Related Party Transactions (Notes)	Sep. 30, 2019
Related Party Transaction [Line Items]
Related Party Transactions Disclosure [Text Block]	RELATED PARTIES 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 September 30, 2018 and December 31, 2018 there was $68 million and $110 million, respectively, due to Historical Dow and its affiliates, reflected in liabilities from discontinued operations - current. Purchases from Historical Dow and its affiliates were $42 million for the nine months ended September 30, 2019, and $41 million and $112 million for the three and nine months ended September 30, 2018, respectively. For the three and nine months ended September 30, 2018, DAS net transfers from Dow were $265 million and $288 million, respectively, reflected in Other, net in the Consolidated Statements of Equity. For the nine months ended September 30, 2019, DAS net transfers from Dow were $88 million. 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 and August 2018, the DowDuPont Board declared first, second and third quarter dividends per share of DowDuPont common stock payable on March 15, 2018, June 15, 2018 and September 15, 2018, respectively. For the nine months ended September 30, 2018, EID declared and paid distributions to DowDuPont of $2,481 million, primarily to fund a portion of DowDuPont's first, second and third quarter share repurchases and dividend payments. 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 $317 million for the nine months ended September 30, 2019, primarily to fund a portion of DowDuPont's dividend payment. In addition, at December 31, 2018, and September 30, 2018, EID had a payable to DowDuPont of $103 million and $250 million included in accounts payable in the interim Condensed 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 United States ("U.S.") 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 25 of the Corteva, Inc. interim 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 September 30, 2019, the outstanding related party loan balance was $4,037 million (which approximates fair value) with an interest rate of 3.68%, and is reflected as long-term debt - related party on EID's interim Condensed Consolidated Balance Sheet. Additionally, EID has incurred tax deductible interest expense of $39 million and $69 million for the three and nine months ended September 30, 2019 associated with the related party loan from Corteva, Inc. As of September 30, 2019, EID had payables to Corteva, Inc., the parent company, of $102 million and $180 million included in accrued and other current liabilities and other noncurrent obligations, respectively, in the interim Condensed Consolidated Balance Sheet related to Corteva's indemnification liabilities to Dow and DuPont per the Separation Agreements (refer to page 16 of the Corteva, Inc. interim Consolidated Financial Statements for further details of the Separation Agreements).