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Subsequent events (Details)	Aug. 12, 2024
Potential ordinary share transactions
Disclosure of non-adjusting events after reporting period [line items]
Divestiture of licensing rights, consideration to receive, percentage of ordinary shares	16.70%

X

- Definition

Divestiture Of Licensing Rights, Consideration To Receive, Percentage Of Ordinary Shares

+ References

No definition available.

+ Details

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Namespace Prefix:	alc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Details

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