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Description of business (Details) $ in Millions	Dec. 31, 2023 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

Number Of Reportable Segments

+ References

No definition available.

+ Details

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

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

Name:	ifrs-full_CorporateInformationAndStatementOfIFRSComplianceAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration