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Right-of-use assets and Lease liabilities - Components of Right-of-Use Assets Depreciation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2019
Disclosure of quantitative information about right-of-use assets [line items] |  |
Depreciation, right-of-use assets | $ 15 | $ 29
Land [member] |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
Depreciation, right-of-use assets | 0 | 1
Buildings [member] |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
Depreciation, right-of-use assets | 10 | 19
Machinery & equipment and other assets [member] |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
Depreciation, right-of-use assets | $ 5 | $ 9

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- Definition The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2019-01-01 -Name IFRS -Number 16 -IssueDate 2018-01-01 -Paragraph 53 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2018-03-01&anchor=para_53_a&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_DepreciationRightofuseAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
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_DisclosureOfQuantitativeInformationAboutRightofuseAssetsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_ClassesOfAssetsAxis=ifrs-full_LandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfAssetsAxis=ifrs-full_BuildingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfAssetsAxis=alc_MachineryEquipmentAndOtherAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |