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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2020
Feb. 15, 2021
Jun. 30, 2020
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2020    
Document Transition Report false    
Entity File Number 1-4858    
Entity Registrant Name INTERNATIONAL FLAVORS & FRAGRANCES INC    
Entity Central Index Key 0000051253    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Incorporation, State or Country Code NY    
Entity Tax Identification Number 13-1432060    
Entity Address, Address Line One 521 West 57th Stree    
Entity Address, City or Town New York    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10019-2960    
City Area Code 212    
Local Phone Number 765-5500    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 13,567,537,235
Entity Common Stock, Shares Outstanding   248,726,256  
Documents Incorporated by Reference Portions of the registrant’s proxy statement for the 2021 Annual Meeting of Shareholders (the “IFF 2021 Proxy Statement”) are incorporated by reference in Part III of this Form 10-K.    
Common stock [Member]      
Entity Information [Line Items]      
Title of 12(b) Security Common Stock, par value 12 1/2¢ per share    
Trading Symbol IFF    
Security Exchange Name NYSE    
6.00% Tangible Equity Units [Member]      
Entity Information [Line Items]      
Title of 12(b) Security 6.00% Tangible Equity Units    
Trading Symbol IFFT    
Security Exchange Name NYSE    
0.500% Senior Notes Due 2021 [Member]      
Entity Information [Line Items]      
Title of 12(b) Security 0.500% Senior Notes due 2021    
Trading Symbol IFF 21    
Security Exchange Name NYSE    
1.750% Senior Notes Due 2024 [Member]      
Entity Information [Line Items]      
Title of 12(b) Security 1.750% Senior Notes due 2024    
Trading Symbol IFF 24    
Security Exchange Name NYSE    
1.800% Senior Notes Due 2026 [Member]      
Entity Information [Line Items]      
Title of 12(b) Security 1.800% Senior Notes due 2026    
Trading Symbol IFF 26    
Security Exchange Name NYSE