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		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Sep. 14, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss) attributable to IFF shareholders	$ 107	$ 28	$ 351	$ (14)
Adjustment related to (increase) decrease in redemption value of redeemable noncontrolling interests in excess of earnings allocated	2	1	2	0
Net income (loss) available to IFF shareholders	$ 109	$ 29	$ 353	$ (14)
Weighted average common shares outstanding (basic) (in shares)	255,000,000	254,000,000	255,000,000	230,000,000
Weighted average shares assuming dilution (diluted) (in shares)	255,000,000	255,000,000	255,000,000	230,000,000
Net income per share - basic (in dollars per share)	$ 0.43	$ 0.11	$ 1.38	$ (0.06)
Net income per share - diluted (in dollars per share)	$ 0.43	$ 0.11	$ 1.38	(0.06)
Tangible Equity Units, Price for Shares Diluted				$ 0.341100
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount				1,000,000,000,000
Price for basic share (usd per share)				$ 0.313400
Tangible Equity Units Final Settlement Rate					$ 0.330911
Tangible Equity Units, Price for Shares Diluted				$ 0.341100
SPC portion of TEUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Adjustment for assumed dilution (in shares)	0	1,000,000	0	0