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
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income attributable to IFF shareholders	$ 170	$ 27	$ 230	$ 18
Adjustment related to (increase) in redemption value of redeemable non-controlling interests in excess of earnings allocated	0	(1)	0	(1)
Net income available to IFF shareholders	$ 170	$ 26	$ 230	$ 17
Weighted average common shares outstanding (basic) (in shares)	255	255	255	255
Weighted average shares assuming dilution (diluted) (in shares)	256	255	256	255
Net income per share - basic (in dollars per share)	$ 0.67	$ 0.11	$ 0.90	$ 0.07
Net income per share - diluted (in dollars per share)	$ 0.66	$ 0.11	$ 0.90	$ 0.07
Stock options and restricted stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Adjustment for assumed dilution (in shares)	1	0	1	0