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v3.19.3.a.u2

Financial and other non-current assets - Other Non-current Assets (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Subclassifications of assets, liabilities and equities [abstract] |  |
Deferred compensation plans | $ 122 | $ 95
Prepaid post-employment benefit plans | 13 | 12
Other non-current assets | 50 | 41
Total other non-current assets | $ 185 | $ 148

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- Definition Non-current Deferred Compensation Plan Asset + References No definition available. + Details
Name: | alc_NoncurrentDeferredCompensationPlanAsset
Namespace Prefix: | alc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Other Non-current Assets, Miscellaneous + References No definition available. + Details
Name: | alc_OtherNoncurrentAssetsMiscellaneous
Namespace Prefix: | alc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of non-current net defined benefit asset. [Refer: Net defined benefit asset] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of non-current assets that the entity does not separately disclose in the same statement or note. [Refer: Non-current assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_OtherNoncurrentAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
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Period Type: | duration