CONSOLIDATED STATEMENT OF INCOME AND COMPREHENSIVE INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Net sales	$ 3,071	$ 1,268	$ 8,625	$ 3,814
Cost of goods sold	1,981	744	5,871	2,242
Gross profit	1,090	524	2,754	1,572
Research and development expenses	156	89	463	256
Selling and administrative expenses	436	235	1,299	695
Amortization of acquisition-related intangibles	195	48	547	145
Restructuring and other charges	6	1	34	8
(Gains) losses on sales of fixed assets	(1)	1	(1)	2
Operating profit	298	150	412	466
Interest expense	74	35	216	99
Other (income) expense, net	(26)	10	(44)	5
Income before taxes	250	105	240	362
Provision for income taxes	53	19	53	61
Net income	197	86	187	301
Net income attributable to noncontrolling interests	3	1	7	5
Net income attributable to IFF stockholders	194	85	180	296
Other comprehensive (loss) income, after tax:
Foreign currency translation adjustments	(339)	79	(493)	(226)
Gains (losses) on derivatives qualifying as hedges	1	(4)	7	(6)
Pension and postretirement net liability	(8)	3	4	10
Net current period other comprehensive income (loss)	(346)	78	(482)	(222)
Comprehensive (loss) income attributable to IFF stockholders	$ (152)	$ 163	$ (302)	$ 74
Net income per share - basic (in dollars per share)	$ 0.76	$ 0.76	$ 0.75	$ 2.68
Net income per share - diluted (in dollars per share)	$ 0.76	$ 0.75	$ 0.75	$ 2.64
Average number of shares outstanding - basic (in shares)	254	112	239	112
Average number of shares outstanding - diluted (in shares)	255	114	239	114