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Cover
Aug. 27, 2019
Cover [Abstract]  
Document Type 6-K
Amendment Flag false
Document Period End Date Aug. 27, 2019
Document Fiscal Period Focus Q2
Document Fiscal Year Focus 2019
Current Fiscal Year End Date --12-31
Entity File Number 001-31269
Entity Registrant Name ALCON INC
Entity Central Index Key 0001167379
Entity Address, Address Line One Chemin de Blandonnet 8
Entity Address, Address Line Two 1214 Vernier
Entity Address, City or Town Geneva
Entity Address, Country CH