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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income attributable to IFF shareholders	$ 27	$ 107	$ 18	$ 351
Adjustment related to (increase) decrease in redemption value of redeemable noncontrolling interests in excess of earnings allocated	(1)	2	(1)	2
Net income available to IFF shareholders	$ 26	$ 109	$ 17	$ 353
Weighted average common shares outstanding (basic) (in shares)	255	255	255	255
Weighted average shares assuming dilution (diluted) (in shares)	255	255	255	255
Net income per share - basic (in dollars per share)	$ 0.11	$ 0.43	$ 0.07	$ 1.38
Net income per share - diluted (in dollars per share)	$ 0.11	$ 0.43	$ 0.07	$ 1.38