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Subsequent events	6 Months Ended
	Jun. 30, 2023
Events After Reporting Period [Abstract]
Subsequent events	Subsequent eventsThese unaudited Condensed Consolidated Interim Financial Statements were authorized for issue by the Audit & Risk Committee on August 15, 2023.

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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 2022-03-24
-Section Disclosure
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=10&code=ifrs-tx-2022-en-r&doctype=Standard&dita_xref=IAS10_g17-22_IAS10_g17-22_TI
-URIDate 2022-03-24

+ Details

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Namespace Prefix:	ifrs-full_
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Balance Type:	na
Period Type:	duration