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Short-Term Borrowings, Long-Term Debt and Available Credit Facilities Uncommitted Credit Facilities and Outstanding Letters of Credit (Details) $ in Millions | Sep. 30, 2019 USD ($)
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Debt Disclosure [Abstract] |
Unused bank credit lines on uncommitted credit facilities | $ 401
Letters of Credit Outstanding, Amount | $ 100

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- Definition Line Of Credit Facility, Remaining Borrowing Capacity, Uncommitted Amount + References No definition available. + Details
Name: | dd_LineOfCreditFacilityRemainingBorrowingCapacityUncommittedAmount
Namespace Prefix: | dd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_DebtDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant