XML 69 R59.htm IDEA: XBRL DOCUMENT
v3.21.1

Debt - Components of Debt (Detail) $ in Millions | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) | Feb. 01, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 16, 2020 USD ($) | May 15, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Gross | $ 11,958 |  | $ 4,413 |  |
Less: Short term borrowings | (628) |  | (634) |  |
Long-term debt | 11,330 |  | 3,779 |  |
2021 Euro Notes | Loans payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior Notes, Current | $ 353 |  | 368 |  |
2021 Euro Notes | Loans payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate | 0.82% |  |  |  |
2023 Notes | Loans payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate | 3.30% |  |  |  |
Credit facilities | $ 299 |  | 299 |  |
2024 Euro Notes | Loans payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate | 1.88% |  |  |  |
Credit facilities | $ 587 |  | 614 |  |
2026 Euro Notes | Loans payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate | 1.93% |  |  |  |
Credit facilities | $ 936 |  | 978 |  |
2028 Notes | Loans payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate | 4.57% |  |  |  |
Credit facilities | $ 397 |  | 397 |  |
2047 Notes | Loans payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate | 4.44% |  |  |  |
Credit facilities | $ 494 |  | 494 |  |
2048 Notes | Loans payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate | 5.12% |  |  |  |
Credit facilities | $ 786 |  | 786 |  |
Term loan credit agreement | Loans payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate | 3.65% |  |  |  |
Credit facilities | $ 240 |  | 240 |  |
2024 Term Loan Facility(7) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum ratio of net debt to EBITDA with step-downs over time | 4.75 |  |  |  |
Debt Instrument, Covenant Compliance, Ratio Of Net Debt To EBITDA With Step-Downs Over Time, Third Full Fiscal Quarter | 4.50 |  |  |  |
Debt Instrument, Covenant Compliance, Ratio Of Net Debt To EBITDA With Step-Downs Over Time, Sixth Full Fiscal Quarter | 3.75 |  |  |  |
Debt Instrument, Covenant Compliance, Ratio Of Net Debt To EBITDA With Step-Downs Over Time, Ninth Full Fiscal Quarter | 3.50 |  |  |  |
2024 Term Loan Facility(7) | Loans payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate | 1.46% |  |  |  |
Credit facilities | $ 625 |  | 0 |  |
2024 Term Loan Facility(7) | Loans payable | Minimum | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate |  | 0.75% |  |  |
2024 Term Loan Facility(7) | Loans payable | Minimum | Base rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate |  | 0.00% |  |  |
2024 Term Loan Facility(7) | Loans payable | Maximum | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate |  | 2.00% |  |  |
2024 Term Loan Facility(7) | Loans payable | Maximum | Base rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate |  | 1.00% |  |  |
2024 Term Loan Facility(7) | Unsecured Debt | Nutrition & Biosciences, Inc |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term loan credit agreement, reduction to bridge loan commitments |  | $ 625 |  |  |
Amortizing Note | Loans payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate | 6.09% |  |  |  |
Credit facilities | $ 24 |  | 36 |  |
Bank overdrafts and other |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Bank overdrafts and other | 11 |  | 2 |  |
Senior Unsecured Term Loan Facilities | Unsecured Debt | Nutrition & Biosciences, Inc |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term loan credit agreement, reduction to bridge loan commitments |  | 1,250 |  |  |
Senior Unsecured Notes | Unsecured Debt | Nutrition & Biosciences, Inc |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term loan credit agreement, reduction to bridge loan commitments |  | $ 6,250 |  | $ 6,250 |
2022 Term Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit facilities | $ 200 |  |  |  |
Maximum ratio of net debt to EBITDA with step-downs over time | 4.75 |  |  |  |
2022 Term Loan | Loans payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  | $ 200
Effective Interest Rate | 1.73% |  |  |  |
Credit facilities | $ 200 |  | 199 |  |
2022 Term Loan | Loans payable | Minimum | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate |  |  |  |  | 1.225%
2022 Term Loan | Loans payable | Minimum | Base rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate |  |  |  |  | 0.225%
2022 Term Loan | Loans payable | Maximum | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate |  |  |  |  | 2.475%
2022 Term Loan | Loans payable | Maximum | Base rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate |  |  |  |  | 1.475%
Senior Notes, Due Two Thousand Twenty Two | Loans payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate | 0.69% |  |  |  |
Credit facilities | $ 300 |  | 0 |  |
Senior Notes, Due Two Thousand Twenty Two | Loans payable | Nutrition & Biosciences, Inc |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate |  |  |  | 0.697% |
Credit facilities |  |  |  | $ 300 |
Senior Notes, Due Two Thousand Twenty Five | Loans payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate | 1.22% |  |  |  |
Credit facilities | $ 1,001 |  | 0 |  |
Senior Notes, Due Two Thousand Twenty Five | Loans payable | Nutrition & Biosciences, Inc |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate |  |  |  | 1.23% |
Credit facilities |  |  |  | $ 1,000 |
Senior Notes, Due Two Thousand Twenty Seven | Loans payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate | 1.56% |  |  |  |
Credit facilities | $ 1,220 |  | 0 |  |
Senior Notes, Due Two Thousand Twenty Seven | Loans payable | Nutrition & Biosciences, Inc |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate |  |  |  | 1.832% |
Credit facilities |  |  |  | $ 1,200 |
Senior Notes, Due Two Thousand Thirty | Loans payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate | 2.21% |  |  |  |
Credit facilities | $ 1,511 |  | 0 |  |
Senior Notes, Due Two Thousand Thirty | Loans payable | Nutrition & Biosciences, Inc |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate |  |  |  | 2.30% |
Credit facilities |  |  |  | $ 1,500 |
Senior Notes, Due Two Thousand Forty | Loans payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate | 3.04% |  |  |  |
Credit facilities | $ 775 |  | 0 |  |
Senior Notes, Due Two Thousand Forty | Loans payable | Nutrition & Biosciences, Inc |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate |  |  |  | 3.268% |
Credit facilities |  |  |  | $ 750 |
Senior Notes, Due Two Thousand Fifty | Loans payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate | 3.21% |  |  |  |
Credit facilities | $ 1,574 |  | 0 |  |
Senior Notes, Due Two Thousand Fifty | Loans payable | Nutrition & Biosciences, Inc |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate |  |  |  | 3.468% |
Credit facilities |  |  |  | $ 1,500 |
2026 Term Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum ratio of net debt to EBITDA with step-downs over time | 4.75 |  |  |  |
Debt Instrument, Covenant Compliance, Ratio Of Net Debt To EBITDA With Step-Downs Over Time, Third Full Fiscal Quarter | 4.50 |  |  |  |
Debt Instrument, Covenant Compliance, Ratio Of Net Debt To EBITDA With Step-Downs Over Time, Sixth Full Fiscal Quarter | 3.75 |  |  |  |
Debt Instrument, Covenant Compliance, Ratio Of Net Debt To EBITDA With Step-Downs Over Time, Ninth Full Fiscal Quarter | 3.50 |  |  |  |
2026 Term Loan | Loans payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate | 1.83% |  |  |  |
Credit facilities | $ 625 |  | $ 0 |  |
2026 Term Loan | Loans payable | Minimum | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate |  | 1.125% |  |  |
2026 Term Loan | Loans payable | Minimum | Base rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate |  | 0.125% |  |  |
2026 Term Loan | Loans payable | Maximum | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate |  | 2.375% |  |  |
2026 Term Loan | Loans payable | Maximum | Base rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective Interest Rate |  | 1.375% |  |  |
2026 Term Loan | Unsecured Debt | Nutrition & Biosciences, Inc |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term loan credit agreement, reduction to bridge loan commitments |  | $ 625 |  |  |

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

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

X
- Definition Debt Instrument, Covenant Compliance, Ratio Of Net Debt To EBITDA With Step-Downs Over Time, Third Full Fiscal Quarter + References No definition available. + Details
Name: | iff_DebtInstrumentCovenantComplianceRatioOfNetDebtToEBITDAWithStepDownsOverTimeThirdFullFiscalQuarter
Namespace Prefix: | iff_
Data Type: | xbrli:pureItemType
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=109500613&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=119400593&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=6877327&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=6876686&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://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=114775744&loc=d3e28551-108399 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 + 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://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=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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=6877327&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, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebtCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebtNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_SeniorLongTermNotes
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying value as of the balance sheet date of the portion of long-term notes having the highest claim on the assets of the issuer in case of bankruptcy or liquidation, due within one year or the normal operating cycle, if longer. Senior note holders are paid off in full before any payments are made to debt holders having a lesser priority of repayment. + 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 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_SeniorNotesCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. + 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)(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 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(a)(16)(a)(1)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: 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(13)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_ShortTermBorrowings
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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

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

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

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

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

X
- Details
Name: | us-gaap_DebtInstrumentAxis=iff_SeniorNotesDueTwoThousandFortyEightMember
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_A2024TermLoanMember
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: | us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
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: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | dei_LegalEntityAxis=iff_NutritionBiosciencesIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

X
- Details
Name: | us-gaap_DebtInstrumentAxis=iff_A2022TermLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

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

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

X
- Details
Name: | us-gaap_DebtInstrumentAxis=iff_A2026TermLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |