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Description of business (Details) $ in Millions	Dec. 31, 2022 USD ($) segment
Corporate Information And Statement Of IFRS Compliance [Abstract]
Number of reporting segments | segment	2
Total asset and net sales threshold | $	$ 5

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- Definition

Corporate Information And Statement Of IFRS Compliance [Abstract]

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No definition available.

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

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Number Of Reportable Segments

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No definition available.

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Name:	alc_NumberOfReportableSegments
Namespace Prefix:	alc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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- Definition

Total Asset and Net Sales Threshold For Separate Disclosure

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No definition available.

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Name:	alc_TotalAssetAndNetSalesThresholdForSeparateDisclosure
Namespace Prefix:	alc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant