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
	Mar. 31, 2024	Mar. 31, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss) available to IFF shareholders	$ 60	$ (9)
Weighted average common shares outstanding (basic) (in shares)	255,000,000	255,000,000
Weighted average shares assuming dilution (diluted) (in shares)	256,000,000	255,000,000
Net income per share - basic (in dollars per share)	$ 0.23	$ (0.04)
Net income per share - diluted (in dollars per share)	$ 0.23	$ (0.04)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		300,000
Stock options and restricted stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Adjustment for assumed dilution (in shares)	1,000,000	0