CONSOLIDATED STATEMENT OF INCOME (LOSS) AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Income Statement [Abstract]
Net sales	$ 2,694	$ 2,925	$ 8,301	$ 8,713
Cost of sales	1,711	1,873	5,253	5,569
Gross profit	983	1,052	3,048	3,144
Research and development expenses	174	162	520	501
Selling and administrative expenses	421	495	1,365	1,478
Amortization of acquisition-related intangibles	146	146	434	467
Impairment of goodwill	0	0	1,153	64
Restructuring and other charges	16	1	54	6
Losses (gains) on sale of assets	0	1	(1)	11
Operating profit (loss)	226	249	(479)	639
Interest expense	48	74	180	236
Gain on extinguishment of debt	0	0	(488)	0
Losses (gains) on business disposals	0	20	111	(348)
Impairment of assets to be disposed of	108	32	108	284
Other expense, net	14	28	44	44
Income (loss) before income taxes	56	95	(434)	423
Provision (benefit) for income taxes	15	36	(44)	96
Net income (loss)	41	59	(390)	327
Net income attributable to non-controlling interests	1	1	2	4
Net income (loss) attributable to IFF shareholders	$ 40	$ 58	$ (392)	$ 323
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
Average number of shares outstanding - basic (in shares)	256	256	256	255
Average number of shares outstanding - diluted (in shares)	257	257	256	256
Other comprehensive income (loss), after tax:
Foreign currency translation adjustments	$ (47)	$ 555	$ 1,115	$ 134
Gains (losses) on derivatives qualifying as hedges; net of tax	0	1	(1)	(5)
Pension and postretirement liability adjustment	(1)	(1)	(50)	7
Net current period other comprehensive income (loss)	(48)	555	1,064	136
Comprehensive income (loss)	(7)	614	674	463
Comprehensive income attributable to non-controlling interests	1	1	2	4
Comprehensive income (loss) attributable to IFF shareholders	$ (8)	$ 613	$ 672	$ 459