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	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net Income
Net income available to IFF stockholders	$ 270	$ 363	$ 456
Net income available to IFF stockholders	$ 268	$ 365	$ 454
Shares
Average number of shares outstanding - basic (in shares)	243	112	112
Average number of shares outstanding - diluted (in shares)	243	114	113
Net Income per Share
Net income per share - basic (in dollars per share)	$ 1.11	$ 3.25	$ 4.05
Net income per share - diluted (in dollars per share)	$ 1.10	$ 3.21	$ 4.00
(Increase) Decrease In Redemption Value, Redeemable Noncontrolling Interest	$ (2)	$ 2	$ (2)
Employee Stock Option And Restricted Stock [Member]
Shares
Adjustment for assumed dilution (in shares)	0	1	0
SPC
Shares
Adjustment for assumed dilution (in shares)	0	1	1