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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 6 Months Ended
Sep. 17, 2018
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Net income (loss) attributable to IFF stockholders   $ 28 $ 87 $ (14) $ 211
Adjustment related to (increase) decrease in redemption value of redeemable noncontrolling interests in excess of earnings allocated   1 (2) 0 4
Net income (loss) available to IFF stockholders   $ 29 $ 85 $ (14) $ 215
Weighted average common shares outstanding (basic) (in shares)   254 112 230 112
Weighted average shares assuming dilution (diluted) (in shares)   255 114 230 114
Net income per share - basic (in dollars per share)   $ 0.11 $ 0.75 $ (0.06) $ 1.91
Net income per share - diluted (in dollars per share)   $ 0.11 $ 0.74 (0.06) 1.89
Tangible Equity Units, Price for Shares Diluted $ 0.3839     $ 0.3411 0.3839
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount       1,000,000  
Tangible Equity Units, Price for Shares Diluted $ 0.3839     $ 0.3411 $ 0.3839
Stock options and restricted stock awards          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Adjustment for assumed dilution (in shares)   0 1 0 1
SPC portion of TEUs          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Adjustment for assumed dilution (in shares)   1 1 0 1