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Related parties transactions (Tables) | 6 Months Ended
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Jun. 30, 2020
Related Party [Abstract] |
Disclosure of transactions between related parties |
($ millions) | Six months ended June 30, 2019(1) |
Contract manufacturing revenues from former parent | 47 |
Purchases of Alcon from former parent | 19 |
(1) Activity presented strictly relates to the period during which Novartis was a related party (prior to the Spin-off on April 9, 2019).

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

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- Definition The disclosure of transactions between the entity and its related parties. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2019-01-01 -Paragraph 18 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2019-en-r&anchor=para_18&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
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Balance Type: | na
Period Type: | duration