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Subsequent events	6 Months Ended
	Jun. 30, 2019
Events After Reporting Period [Abstract]
Subsequent events	Subsequent events These unaudited Condensed Consolidated Interim Financial Statements were authorized for issue by the Company's Audit & Risk Committee on August 20, 2019.

X

- Definition

Events After Reporting Period [Abstract]

+ References

No definition available.

+ Details

Name:	alc_EventsAfterReportingPeriodAbstract
Namespace Prefix:	alc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

The entire disclosure for events after the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 10
-IssueDate 2018-01-01
-Section Disclosure
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=10&date=2018-03-01&anchor=sect_Disclosure&doctype=Standard
-URIDate 2018-03-16

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration