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Restructuring and Other Charges - Narrative (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other charges | $ 21 | $ 2 | $ 38 | $ 5 |
IFF Productivity Program |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Additional Charges (Reversals), Net |  |  | 38 |  |
IFF Productivity Program | Minimum | Taste, Food Ingredients, Health And Biosciences, And Scent |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 100 |  | 100 |  | $ 100
IFF Productivity Program | Maximum | Taste, Food Ingredients, Health And Biosciences, And Scent |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 120 |  | 120 |  | 120
Employee Severance | IFF Productivity Program |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Additional Charges (Reversals), Net | $ 21 |  | $ 38 |  |
Restructuring Costs |  |  |  |  | 41
Fixed Asset Write Down [Member] | IFF Productivity Program |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Costs |  |  |  |  | $ 20

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