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v3.20.4

Segment Information - Narrative (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2020 segment
Disclosure of operating segments [line items] |  |  |
Number of reporting segments | segment |  |  | 2
Surgical [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Segment contribution, increase (decrease) | $ 34 | $ 33 |
Vision Care [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Segment contribution, increase (decrease) | $ 17 | $ 6 |

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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 Segment Contribution, Increase (Decrease) + References No definition available. + Details
Name: | alc_SegmentContributionIncreaseDecrease
Namespace Prefix: | alc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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_DisclosureOfOperatingSegmentsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_SegmentsAxis=alc_SurgicalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_SegmentsAxis=alc_VisionCareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |