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Cover Page
 12 Months Ended
Dec. 31, 2020
shares
Document Information [Line Items]  
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Document Transition Report false
Document Shell Company Report false
Entity File Number 001-31269
Entity Registrant Name Alcon Inc.
Entity Incorporation, State or Country Code V8
Entity Address, Address Line One Rue Louis-d'Affry 6
Entity Address, Postal Zip Code 1701
Entity Address, City or Town Fribourg
Entity Address, Country CH
Contact Personnel Fax Number 41 58 911 32 22
Title of 12(b) Security Ordinary Shares, nominal value CHF 0.04 per share
Trading Symbol ALC
Security Exchange Name NYSE
Entity Common Stock, Shares Outstanding 489,219,355
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 Emerging Growth Company false
ICFR Auditor Attestation Flag true
Document Accounting Standard International Financial Reporting Standards
Entity Shell Company false
Amendment Flag false
Current Fiscal Year End Date --12-31
Document Fiscal Period Focus FY
Document Fiscal Year Focus 2020
Document Period End Date Dec. 31, 2020
Entity Central Index Key 0001167379
Business Contact [member]  
Document Information [Line Items]  
Contact Personnel Name Royce Bedward
Entity Address, Address Line One Chemin de Blandonnet 8
Entity Address, Postal Zip Code 1214
Entity Address, Address Line Two Vernier
Entity Address, City or Town Geneva
Entity Address, Country CH
City Area Code 58
Local Phone Number 911 20 00