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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 14, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Net income attributable to IFF stockholders $ 194 $ 85 $ 180 $ 296  
Adjustment related to (increase) decrease in redemption value of redeemable noncontrolling interests in excess of earnings allocated (1) 1 (1) 5  
Net income available to IFF stockholders $ 193 $ 86 $ 179 $ 301  
Weighted average common shares outstanding (basic) (in shares) 254 112 239 112  
Weighted average shares assuming dilution (diluted) (in shares) 255 114 239 114  
Net income per share - basic (in dollars per share) $ 0.76 $ 0.76 $ 0.75 $ 2.68  
Net income per share - diluted (in dollars per share) $ 0.76 $ 0.75 0.75 2.64  
Tangible Equity Units, Price for Shares Diluted     0.330911 0.383900  
Price for basic share (usd per share)     0.330911 0.313400  
Tangible Equity Units Final Settlement Rate         $ 0.330911
Tangible Equity Units, Price for Shares Diluted     $ 0.330911 $ 0.383900  
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 0 1  
SPC portion of TEUs          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Adjustment for assumed dilution (in shares) 0 1 0 1