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Net Income Per Share - Reconciliation of Shares Used in Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Net Income (Loss)      
Net income (loss) available to IFF shareholders $ 243 $ (2,567) $ (1,871)
Net income (loss) available to IFF shareholders $ 243 $ (2,565) $ (1,868)
Shares      
Average number of shares outstanding - basic (in shares) 256 255 255
Average number of shares outstanding - diluted (in shares) 256 255 255
Net income per share - basic (in dollars per share)      
Net income per share - basic (in dollars per share) $ 0.95 $ (10.05) $ (7.32)
Net income per share - diluted (in dollars per share) $ 0.95 $ (10.05) $ (7.32)
(Increase) Decrease In Redemption Value, Redeemable Noncontrolling Interest $ 0 $ 2 $ 3