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Legal proceedings update (Details)	Aug. 08, 2019 complaint
Commencement of major litigation [member]
Disclosure of contingent liabilities [line items]
Number of claims dismissed	2

X

- Definition

Loss Contingency, Claims Dismissed, Number

+ References

No definition available.

+ Details

Name:	alc_LossContingencyClaimsDismissedNumber
Namespace Prefix:	alc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=ifrs-full_CommencementOfMajorLitigationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: