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Subsequent events	6 Months Ended
	Jun. 30, 2020
Events After Reporting Period [Abstract]
Subsequent events	Subsequent events These unaudited Condensed Consolidated Interim Financial Statements were authorized for issue by the Audit & Risk Committee on August 18, 2020.

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- Definition

Events After Reporting Period [Abstract]

+ References

No definition available.

+ Details

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Namespace Prefix:	alc_
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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 2019-01-01
-Section Disclosure
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=10&code=ifrs-tx-2019-en-r&doctype=Standard&dita_xref=IAS10_g17-22_TI
-URIDate 2019-03-27

+ Details

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