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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
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Net income attributable to IFF shareholders $ 59 $ 25 $ 289 $ 43
Adjustment related to (increase) in redemption value of redeemable non-controlling interests in excess of earnings allocated 0 0 0 (1)
Net income available to IFF shareholders $ 59 $ 25 $ 289 $ 42
Weighted average common shares outstanding (basic) (in shares) 256 255 255 255
Weighted average shares assuming dilution (diluted) (in shares) 257 256 256 255
Net income per share - basic (in dollars per share) $ 0.23 $ 0.10 $ 1.13 $ 0.16
Net income per share - diluted (in dollars per share) $ 0.23 $ 0.10 $ 1.13 $ 0.16
Stock options and restricted stock awards        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Adjustment for assumed dilution (in shares) 1 1 1 0