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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, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Sep. 14, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Net (loss) income attributable to IFF shareholders $ (2,197) $ 194 $ (1,846) $ 180  
Adjustment related to (increase) decrease in redemption value of redeemable noncontrolling interests in excess of earnings allocated 1 (1) 3 (1)  
Net (loss) income available to IFF shareholders $ (2,196) $ 193 $ (1,843) $ 179  
Weighted average common shares outstanding (basic) (in shares) 255,000,000 254,000,000 255,000,000 239,000,000  
Weighted average shares assuming dilution (diluted) (in shares) 255,000,000 255,000,000 255,000,000 239,000,000  
Net income per share - basic (in dollars per share) $ (8.60) $ 0.76 $ (7.22) $ 0.75  
Net income per share - diluted (in dollars per share) $ (8.60) $ 0.76 $ (7.22) $ 0.75  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 300,000   400,000    
Tangible Equity Units Final Settlement Rate         $ 0.330911
Stock Options or Stock-Settled Appreciation Rights          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 300,000 0 300,000 0  
Stock options and restricted stock awards          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Adjustment for assumed dilution (in shares) 0 1,000,000 0 0