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
	Mar. 31, 2022	Mar. 31, 2021	Sep. 14, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss) attributable to IFF stockholders	$ 244	$ (42)
Adjustment related to (increase) decrease in redemption value of redeemable noncontrolling interests in excess of earnings allocated	0	(1)
Net income (loss) available to IFF stockholders	$ 244	$ (43)
Weighted average common shares outstanding (basic) (in shares)	255,000,000	206,000,000
Weighted average shares assuming dilution (diluted) (in shares)	255,000,000	206,000,000
Net income per share - basic (in dollars per share)	$ 0.96	$ (0.21)
Net income per share - diluted (in dollars per share)	$ 0.96	(0.21)
Tangible Equity Units, Price for Shares Diluted		$ 0.366500
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		$ 0.366500