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Related parties transactions - Schedule of related parties transactions (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 08, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Related Party [Abstract] |  |  |  |
Sales to former parent |  | $ 0 | $ 4 | $ 4
Contract manufacturing revenues from former parent | $ 47 | 47 | 0 | 0
Purchases from former parent | $ 19 | 19 | 4 | $ 3
Receivables from former parent |  | 0 | 20 |
Payables to former parent |  | 0 | 85 |
Other financial receivables from former parent |  | 0 | 39 |
Other financial liabilities to former parent |  | $ 0 | $ 67 |

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- Definition Other Current Financial Payables To Related Parties + References No definition available. + Details
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Namespace Prefix: | alc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Other Current Financial Receivables Due From Related Parties + References No definition available. + Details
Name: | alc_OtherCurrentFinancialReceivablesDueFromRelatedParties
Namespace Prefix: | alc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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
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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 2019-01-01 -Paragraph 21 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2019-en-r&anchor=para_21_a&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of revenue arising from the sale of goods in related party transactions. [Refer: Revenue; Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 24 -IssueDate 2019-01-01 -Paragraph 21 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2019-en-r&anchor=para_21_a&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of current payables due to related parties. [Refer: Related parties [member]; Payables to related parties] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 78 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_78&doctype=Standard -URIDate 2019-03-27 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of current receivables due from related parties. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_78_b&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
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Balance Type: | debit
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