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

Commercial Paper, Maturity Great Than Three Months

No definition available.

Name:	iff_CommercialPaperMaturityGreatThanThreeMonths
Namespace Prefix:	iff_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant