XML 108 R91.htm IDEA: XBRL DOCUMENT v3.25.0.1

Employee Benefits - Fair Value Hierarchy of Plan Assets (Detail) - Pension Plan - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 9	$ 505	$ 498
U.S. Plans | Fair Value Of Plan Assets Before Receivables
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9	504
U.S. Plans | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		6
U.S. Plans | Government & Government Agency Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		5
U.S. Plans | Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		82
U.S. Plans | Municipal Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		5
U.S. Plans | Pooled Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9	406
U.S. Plans | Receivables
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		1
U.S. Plans | Level 1 | Fair Value Of Plan Assets Before Receivables
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.S. Plans | Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
U.S. Plans | Level 1 | Government & Government Agency Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
U.S. Plans | Level 1 | Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
U.S. Plans | Level 1 | Municipal Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
U.S. Plans | Level 2 | Fair Value Of Plan Assets Before Receivables
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	98
U.S. Plans | Level 2 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		6
U.S. Plans | Level 2 | Government & Government Agency Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		5
U.S. Plans | Level 2 | Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		82
U.S. Plans | Level 2 | Municipal Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		5
U.S. Plans | Level 3 | Fair Value Of Plan Assets Before Receivables
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.S. Plans | Level 3 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
U.S. Plans | Level 3 | Government & Government Agency Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
U.S. Plans | Level 3 | Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
U.S. Plans | Level 3 | Municipal Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
U.S. Plans | Fair Value Measured at Net Asset Value Per Share | Pooled Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2	65
U.S. Plans | Fair Value Measured at Net Asset Value Per Share | Fixed Income Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7	341
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	920	1,000	$ 920
Non-U.S. Plans | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11	27
Non-U.S. Plans | U.S. Large Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	101	90
Non-U.S. Plans | U.S. Mid Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8	8
Non-U.S. Plans | U.S. Small Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		1
Non-U.S. Plans | Non-U.S. Large Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	43	50
Non-U.S. Plans | Non-U.S. Mid Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3	5
Non-U.S. Plans | Non-U.S. Small Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1	1
Non-U.S. Plans | Emerging Markets
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9	8
Non-U.S. Plans | U.S. Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	42	29
Non-U.S. Plans | Non-U.S. Treasuries/Government Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	165	194
Non-U.S. Plans | Non-U.S. Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	116	138
Non-U.S. Plans | Non-U.S. Asset-Backed Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	60	56
Non-U.S. Plans | Non-U.S. Other Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10	2
Non-U.S. Plans | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	270	247
Non-U.S. Plans | Derivative Financial Instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		28
Non-U.S. Plans | Absolute Return Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1	5
Non-U.S. Plans | Private Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		27
Non-U.S. Plans | Property
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	80	84
Non-U.S. Plans | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	920	1,000
Non-U.S. Plans | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	441	475
Non-U.S. Plans | Level 1 | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11	27
Non-U.S. Plans | Level 1 | U.S. Large Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	101	90
Non-U.S. Plans | Level 1 | U.S. Mid Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8	8
Non-U.S. Plans | Level 1 | U.S. Small Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		1
Non-U.S. Plans | Level 1 | Non-U.S. Large Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	43	50
Non-U.S. Plans | Level 1 | Non-U.S. Mid Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3	5
Non-U.S. Plans | Level 1 | Non-U.S. Small Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1	1
Non-U.S. Plans | Level 1 | Emerging Markets
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9	8
Non-U.S. Plans | Level 1 | U.S. Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	42	29
Non-U.S. Plans | Level 1 | Non-U.S. Treasuries/Government Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	165	194
Non-U.S. Plans | Level 1 | Non-U.S. Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	50	50
Non-U.S. Plans | Level 1 | Non-U.S. Asset-Backed Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Plans | Level 1 | Non-U.S. Other Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	2
Non-U.S. Plans | Level 1 | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Plans | Level 1 | Derivative Financial Instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Non-U.S. Plans | Level 1 | Absolute Return Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1	3
Non-U.S. Plans | Level 1 | Private Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Non-U.S. Plans | Level 1 | Property
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7	7
Non-U.S. Plans | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	136	448
Non-U.S. Plans | Level 2 | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Plans | Level 2 | U.S. Large Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Plans | Level 2 | U.S. Mid Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Plans | Level 2 | U.S. Small Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Non-U.S. Plans | Level 2 | Non-U.S. Large Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Plans | Level 2 | Non-U.S. Mid Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Plans | Level 2 | Non-U.S. Small Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Plans | Level 2 | Emerging Markets
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Plans | Level 2 | U.S. Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Plans | Level 2 | Non-U.S. Treasuries/Government Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Plans | Level 2 | Non-U.S. Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	66	88
Non-U.S. Plans | Level 2 | Non-U.S. Asset-Backed Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	60	56
Non-U.S. Plans | Level 2 | Non-U.S. Other Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10	0
Non-U.S. Plans | Level 2 | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	247
Non-U.S. Plans | Level 2 | Derivative Financial Instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		28
Non-U.S. Plans | Level 2 | Absolute Return Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	2
Non-U.S. Plans | Level 2 | Private Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		27
Non-U.S. Plans | Level 2 | Property
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Plans | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	343	77
Non-U.S. Plans | Level 3 | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Plans | Level 3 | U.S. Large Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Plans | Level 3 | U.S. Mid Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Plans | Level 3 | U.S. Small Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Non-U.S. Plans | Level 3 | Non-U.S. Large Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Plans | Level 3 | Non-U.S. Mid Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Plans | Level 3 | Non-U.S. Small Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Plans | Level 3 | Emerging Markets
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Plans | Level 3 | U.S. Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Plans | Level 3 | Non-U.S. Treasuries/Government Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Plans | Level 3 | Non-U.S. Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Plans | Level 3 | Non-U.S. Asset-Backed Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Plans | Level 3 | Non-U.S. Other Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Plans | Level 3 | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	270	0
Non-U.S. Plans | Level 3 | Derivative Financial Instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Non-U.S. Plans | Level 3 | Absolute Return Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Plans | Level 3 | Private Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Non-U.S. Plans | Level 3 | Property
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 73	$ 77

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

Name:	us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480482/715-20-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(02)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(ii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(ii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

+ Details

Name:	us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_RetirementPlanSponsorLocationAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=iff_FairValueOfPlanAssetsBeforeReceivablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_CashAndCashEquivalentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=iff_GovernmentAndGovernmentAgencyBondsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_CorporateBondSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_MunicipalBondsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=iff_PooledFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=iff_ReceivablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_FixedIncomeFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_ForeignPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_CashMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DefinedBenefitPlanEquitySecuritiesUsLargeCapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DefinedBenefitPlanEquitySecuritiesUsMidCapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DefinedBenefitPlanEquitySecuritiesUsSmallCapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DefinedBenefitPlanEquitySecuritiesLargeCapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DefinedBenefitPlanEquitySecuritiesMidCapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DefinedBenefitPlanEquitySecuritiesSmallCapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=iff_EmergingMarketsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=iff_USCorporateBondsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=iff_NonUSTreasuriesOrGovernmentBondsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=iff_NonUSCorporateBondsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=iff_NonUSAssetBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=iff_NonUSOtherFixedIncomeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=iff_InsuranceContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DerivativeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=iff_AbsoluteReturnHedgeFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_PrivateEquityFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_RealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel12And3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: