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Trade receivables - Trade receivables from closely monitored countries (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of geographical areas [line items] |  |  |  |
Total gross trade receivables | $ 1,438 | $ 1,307 |  |
Provisions for doubtful trade receivables | (48) | (54) | $ (77) | $ (55)
Russia, Brazil, And Turkey [member] |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Provisions for doubtful trade receivables | (13) | (16) |  |
Not overdue [member] |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Total gross trade receivables | 1,135 | 1,018 |  |
Not overdue [member] | Russia, Brazil, And Turkey [member] |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Total gross trade receivables | 209 | 216 |  |
Past due for more than one year [member] |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Total gross trade receivables | 36 | 47 |  |
Past due for more than one year [member] | Russia, Brazil, And Turkey [member] |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Total gross trade receivables | $ 10 | $ 14 |  |

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- Definition Trade Receivables, Gross + References No definition available. + Details
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Namespace Prefix: | alc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |