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CONSOLIDATED STATEMENT OF CASH FLOWS (Parenthetical) $ in Millions | Dec. 31, 2021 USD ($)
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Statement of Cash Flows [Abstract] |
Commercial paper with original maturities greater than 3 months | $ 75

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- Definition Commercial Paper, Maturity Great Than Three Months + References No definition available. + Details
Name: | iff_CommercialPaperMaturityGreatThanThreeMonths
Namespace Prefix: | iff_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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