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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, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss) available to IFF shareholders	$ 612	$ 170	$ (406)	$ 230
Weighted average common shares outstanding (basic) (in shares)	256,000,000	255,000,000	256,000,000	255,000,000
Weighted average shares assuming dilution (diluted) (in shares)	257,000,000	256,000,000	256,000,000	256,000,000
Net income per share - basic (in dollars per share)	$ 2.39	$ 0.67	$ (1.59)	$ 0.90
Net income per share - diluted (in dollars per share)	$ 2.38	$ 0.66	$ (1.59)	$ 0.90
Antidilutive securities excluded from computation of earnings per share, amount			1,000,000
Stock options and restricted stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Adjustment for assumed dilution (in shares)	1,000,000	1,000,000	0	1,000,000

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