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, 2023	Dec. 31, 2022	Dec. 31, 2021
Net (Loss) Income
Net (loss) income available to IFF shareholders	$ (2,567)	$ (1,871)	$ 270
Net (loss) income available to IFF shareholders	$ (2,565)	$ (1,868)	$ 268
Shares
Average number of shares outstanding - basic (in shares)	255	255	243
Average number of shares outstanding - diluted (in shares)	255	255	243
Net income per share - basic (in dollars per share)
Net income per share - basic (in dollars per share)	$ (10.05)	$ (7.32)	$ 1.11
Net income per share - diluted (in dollars per share)	$ (10.05)	$ (7.32)	$ 1.10
(Increase) Decrease In Redemption Value, Redeemable Noncontrolling Interest	$ 2	$ 3	$ (2)