XML 82 R66.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Debt - Additional Information (Detail) $ / shares in Units, € in Millions |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 29, 2021 USD ($) | Sep. 25, 2021 EUR (€) | Jul. 28, 2021 USD ($) | Sep. 17, 2018 USD ($) $ / shares | Jun. 06, 2018 USD ($) | May 18, 2017 USD ($) | Mar. 14, 2016 USD ($) | Mar. 14, 2016 EUR (€) | Apr. 04, 2013 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Aug. 25, 2020 USD ($) | Sep. 25, 2018 USD ($) | Sep. 25, 2018 EUR (€) | Mar. 14, 2016 EUR (€)
Schedule Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount still available for additional borrowings |  |  |  |  |  |  |  |  |  |  | $ 2,000,000,000 |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  | $ 11,400,000,000 |  | $ 4,413,000,000 |  |  |  |
Gross Proceeds |  |  |  |  | $ 825,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Quarterly installments | $ / shares |  |  |  |  | $ 0.75 |  |  |  |  |  |  |  |  |  |  |  |
Initial installment | $ / shares |  |  |  |  | $ 0.7333 |  |  |  |  |  |  |  |  |  |  |  |
Interest and partial repayment of principal |  |  |  |  | 3.79% |  |  |  |  |  |  |  |  |  |  |  |
Repurchase price of principal amount of Senior Notes in percentage |  |  |  |  |  |  |  |  |  |  | 101.00% |  |  |  |  |  |
Revolving Loan Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |
Term Loan Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt | $ 120,000,000 | $ 120,000,000 |  |  |  |  |  |  |  |  |  | $ 110,000,000 |  |  |  |  |
Senior Notes, Euro Notes, 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt | € |  |  | € 300 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% | 0.50% |
Senior notes | € |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 300 |
Senior Notes, Euro Notes, 2024 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes | € |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 500
Interest rate of debt |  |  |  |  |  |  |  | 1.75% |  |  |  |  |  |  |  |  | 1.75%
Loans Payable [Member] | Senior Notes, Euro Notes, 2024 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes |  |  |  |  |  |  |  |  |  |  | $ 565,000,000 |  | 614,000,000 |  |  |  |
Interest rate of debt |  |  |  |  |  |  |  |  |  |  | 1.88% |  |  |  |  |  |
Senior Notes, Euro Notes, 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 350,000,000 | 298 |
Senior Notes, Euro Notes, 2026 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 932,000,000 | € 794 |
Senior Notes - 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes discount |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |
Proceeds related to the issuance of Senior Notes |  |  |  |  |  |  |  |  |  | 298,000,000 |  |  |  |  |  |  |
Underwriting discount |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |
Other deferred costs |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |
Senior notes - 2047 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |
Senior notes discount |  |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |
Proceeds related to the issuance of Senior Notes |  |  |  |  |  |  | 494,000,000 |  |  |  |  |  |  |  |  |  |
Underwriting discount |  |  |  |  |  |  | 4,000,000 |  |  |  |  |  |  |  |  |  |
Other deferred costs |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |
Gain (loss) on pre-issuance hedges |  |  |  |  |  |  | $ (5,000,000) |  |  |  |  |  |  |  |  |  |
Senior Notes, Euro Notes, 2024 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  |  |  |  | 8 years | 8 years |  |  |  |  |  |  |  |
Interest rate of debt |  |  |  |  |  |  |  | 1.75% |  |  |  |  |  |  |  |  | 1.75%
Senior notes discount | € |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 1
Proceeds related to the issuance of Senior Notes | € |  |  |  |  |  |  |  |  | € 496 |  |  |  |  |  |  |  |
Underwriting discount | € |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 3
Other deferred costs |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |
Gain (loss) on pre-issuance hedges |  |  |  |  |  |  |  | $ (3,000,000) |  |  |  |  |  |  |  |  |
Citibank, N.A [Member] | Revolving Loan Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility |  |  |  | $ 2,000,000,000 |  |  |  |  |  |  | $ 1,025,000,000.000 |  |  |  |  |  |
Debt related commitment fees and debt issuance costs |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Line of credit |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
Citibank, N.A [Member] | Revolving Loan Facility [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum ratio of net debt to EBI TDA with step-downs over time |  |  |  |  |  |  |  |  |  |  | 3.50 |  |  |  |  |  |
Citibank, N.A [Member] | Revolving Loan Facility [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum ratio of net debt to EBI TDA with step-downs over time |  |  |  |  |  |  |  |  |  |  | 4.75 |  |  |  |  |  |
Citibank, N.A [Member] | Base Rate [Member] | Revolving Loan Facility [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin on variable rate |  |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Citibank, N.A [Member] | Base Rate [Member] | Revolving Loan Facility [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin on variable rate |  |  |  | 0.625% |  |  |  |  |  |  |  |  |  |  |  |  |
Citibank, N.A [Member] | Eurocurrency Rate | Revolving Loan Facility [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin on variable rate |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Citibank, N.A [Member] | Eurocurrency Rate | Revolving Loan Facility [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin on variable rate |  |  |  | 1.625% |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Amount [Member] | Senior Notes - 2028 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes |  |  |  |  |  |  |  |  |  |  | $ 397,000,000 |  | 397,000,000 |  |  |  |
Carrying Amount [Member] | Senior Notes - 2048 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes |  |  |  |  |  |  |  |  |  |  | $ 786,000,000 |  | $ 786,000,000 |  |  |  |
Amortizing Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Proceeds |  |  |  |  | $ 139,000,000 |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Debt Instrument, Covenant Compliance, Ratio Of Net Debt To EBITDA With Step-Downs Over Time + References No definition available. + Details
Name: | iff_DebtInstrumentCovenantComplianceRatioOfNetDebtToEBITDAWithStepDownsOverTime
Namespace Prefix: | iff_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Repurchase Price As Percentage Of Principal Amount Of Senior Notes + References No definition available. + Details
Name: | iff_RepurchasePriceAsPercentageOfPrincipalAmountOfSeniorNotes
Namespace Prefix: | iff_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule Of Borrowings [Line Items] + References No definition available. + Details
Name: | iff_ScheduleOfBorrowingsLineItems
Namespace Prefix: | iff_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tangible Equity Units Initial Installment + References No definition available. + Details
Name: | iff_TangibleEquityUnitsInitialInstallment
Namespace Prefix: | iff_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tangible Equity Units, Interest and Partial Repayment of Principal + References No definition available. + Details
Name: | iff_TangibleEquityUnitsInterestandPartialRepaymentofPrincipal
Namespace Prefix: | iff_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Tangible Equity Units Proceeds, Gross + References No definition available. + Details
Name: | iff_TangibleEquityUnitsProceedsGross
Namespace Prefix: | iff_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Tangible Equity Units Quarterly Installments + References No definition available. + Details
Name: | iff_TangibleEquityUnitsQuarterlyInstallments
Namespace Prefix: | iff_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
Name: | us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after accumulated amortization, of debt discount. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 + Details
Name: | us-gaap_DebtInstrumentUnamortizedDiscount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the charge against earnings during the period for commitment fees and debt issuance expenses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
Name: | us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399 + Details
Name: | us-gaap_DeferredFinanceCostsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Gain (loss) incurred in hedging activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + Details
Name: | us-gaap_GainLossOnOilAndGasHedgingActivity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
Name: | us-gaap_LineOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Gross amount of other deferred costs capitalized at the end of the reporting period. Does not include deferred finance costs or deferred acquisition costs of insurance companies. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_OtherDeferredCostsGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585 + Details
Name: | us-gaap_RepaymentsOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 + Details
Name: | us-gaap_SeniorLongTermNotes
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
Name: | us-gaap_SeniorNotes
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=iff_TermLoanCreditAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=iff_SeniorNotesEuroNotesDueTwoThousandTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=iff_SeniorNotesEuroNotesDueTwoThousandTwentyFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_LoansPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=iff_SeniorNotesEuroNotesDueTwoThousandTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=iff_SeniorNotesEuroNotesDueTwoThousandTwentySixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=iff_SeniorNotesDueTwoThousandTwentyThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=iff_SeniorNotesDueTwoThousandFortySevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=iff_SeniorNotesEuroNotesDueTwoThousandTwentyFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LineOfCreditFacilityAxis=iff_CitibankN.AMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=iff_EurocurrencyRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementBasisAxis=us-gaap_CarryingReportedAmountFairValueDisclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByLiabilityClassAxis=iff_SeniorNotesDueTwoThousandTwentyEightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByLiabilityClassAxis=iff_SeniorNotesDueTwoThousandFortyEightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | iff_TangibleEquityUnitsAllocationAxis=iff_AmortizingNoteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |