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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss) attributable to IFF shareholders	$ 25	$ (2,197)	$ 43	$ (1,846)
Adjustment related to (increase) decrease in redemption value of redeemable noncontrolling interests in excess of earnings allocated	0	1	(1)	3
Net income (loss) available to IFF shareholders	$ 25	$ (2,196)	$ 42	$ (1,843)
Weighted average common shares outstanding (basic) (in shares)	255,000,000	255,000,000	255,000,000	255,000,000
Weighted average shares assuming dilution (diluted) (in shares)	256,000,000	255,000,000	255,000,000	255,000,000
Net income per share - basic (in dollars per share)	$ 0.10	$ (8.60)	$ 0.16	$ (7.22)
Net income per share - diluted (in dollars per share)	$ 0.10	$ (8.60)	$ 0.16	$ (7.22)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		300,000		400,000
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	0	0