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Business Divestitures and Assets and Liabilities Held for Sale - Fair Value of Sale Consideration Received (Details) - Cosmetic Ingredients - Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations $ in Millions	Apr. 02, 2024 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds received from business disposals	$ 839
Direct costs to sell	(10)
Fair value of sale consideration	$ 829

X

- Definition

Disposal Group, Including Discontinued Operation, Direct Costs To Sell

+ References

No definition available.

+ Details

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Namespace Prefix:	iff_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Proceeds from Divestiture of Businesses, Less Costs To Sell

+ References

No definition available.

+ Details

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Namespace Prefix:	iff_
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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-12

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- Details

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