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Tangible Equity Units (Details) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Sep. 17, 2018 | Dec. 31, 2021
Equity [Abstract] |  |
Tangible equity units issued | 16,500,000 |
Tangible equity units proceeds | $ 800 |
Price for basic share (in dollars per share) |  | $ 0.330911

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- Definition Tangible Equity Units Issued + References No definition available. + Details
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- Definition Tangible Equity Units, Price for Shares Basic + References No definition available. + Details
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- Definition Tangible Equity Units Proceeds + References No definition available. + Details
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Namespace Prefix: | iff_
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Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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