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Right-of-use assets and Lease liabilities - Components of Right-of-Use Assets Depreciation (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Depreciation of right-of-use assets | $ 79 | $ 66 | $ 0
Land [member] |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Depreciation of right-of-use assets | 1 | 1 |
Buildings and improvements [member] |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Depreciation of right-of-use assets | 59 | 47 |
Machinery & equipment and other assets [member] |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Depreciation of right-of-use assets | $ 19 | $ 18 |

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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 -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_a&doctype=Standard -URIDate 2020-01-01 + 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
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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: |