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Employee Benefits (Tables) | 3 Months Ended
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Mar. 31, 2026
Retirement Benefits [Abstract] |
Pension and Other Defined Contribution Retirement Plan Expenses | Pension and other defined contribution retirement plan expenses included the following components:
(DOLLARS IN MILLIONS) | U.S. Plans
Three Months Ended March 31, |  |
2026 |  | 2025 |  |  |  |
Interest cost on projected benefit obligation(1) | $ | — |  |  | $ | 1 |  |  |  |  |
Net periodic benefit cost | $ | — |  |  | $ | 1 |  |  |  |  |
(DOLLARS IN MILLIONS) | Non-U.S. Plans
Three Months Ended March 31, |  |
2026 |  | 2025 |  |  |  |
Service cost for benefits earned(2) | $ | 5 |  |  | $ | 5 |  |  |  |  |
Interest cost on projected benefit obligation(1) | 9 |  |  | 9 |  |  |  |  |
Expected return on plan assets(1) | (15) |  |  | (11) |  |  |  |  |
Net amortization and deferrals(1) | 2 |  |  | 1 |  |  |  |  |
Net periodic benefit cost | $ | 1 |  |  | $ | 4 |  |  |  |  |
_______________________ (1)Included as a component of Other expense, net. (2)Included as a component of Operating profit (loss).
Postretirement Benefits Other Than Pension Expenses | Expense recognized for post-retirement benefits other than pensions included the following components:
| Three Months Ended March 31, |  |
(DOLLARS IN MILLIONS) | 2026 |  | 2025 |  |  |  |
Interest cost on projected benefit obligation | $ | 1 |  |  | $ | 1 |  |  |  |  |
Net amortization and deferrals | — |  |  | (1) |  |  |  |  |
Total postretirement benefit expense | $ | 1 |  |  | $ | — |  |  |  |  |

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- Definition Table for Net Periodic Benefit Cost and Changes in Plan Assets and Benefit Obligations Recognized in OCI. + References No definition available. + Details
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Namespace Prefix: | iff_
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (q) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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