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v3.19.2

Related parties transactions - Additional information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Apr. 08, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Related Party [Abstract] |  |  |  |  |
Contract manufacturing revenues from former parent | $ 0 |  | $ 0 | $ 47 | $ 0
Purchases of the Company from former parent | $ 0 |  | 1 | $ 19 | 2
Services received, related party transactions |  | $ 40 | $ 140 |  | $ 276

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- Definition Related Party [Abstract] + References No definition available. + Details
Name: | alc_RelatedPartyAbstract
Namespace Prefix: | alc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Revenue From Contract Manufacturing, Related Party Transactions + References No definition available. + Details
Name: | alc_RevenueFromContractManufacturingRelatedPartyTransactions
Namespace Prefix: | alc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of goods purchased by the entity in related party transactions. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 24 -IssueDate 2018-01-01 -Paragraph 21 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2018-03-01&anchor=para_21_a&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_PurchasesOfGoodsRelatedPartyTransactions
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of services received in related party transactions. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 24 -IssueDate 2018-01-01 -Paragraph 21 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2018-03-01&anchor=para_21_c&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_ServicesReceivedRelatedPartyTransactions
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration