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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	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss) available to IFF shareholders	$ 40	$ 58	$ (392)	$ 323
Weighted average common shares outstanding (basic) (in shares)	256	256	256	255
Weighted average shares assuming dilution (diluted) (in shares)	257	257	256	256
Net income per share - basic (in dollars per share)	$ 0.16	$ 0.23	$ (1.53)	$ 1.27
Net income per share - diluted (in dollars per share)	$ 0.16	$ 0.23	$ (1.53)	$ 1.27
Antidilutive securities excluded from computation of earnings per share, amount			1
Stock options and restricted stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Adjustment for assumed dilution (in shares)	1	1	0	1

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