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Related parties transactions - Schedule of related parties transactions (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Related Party [Abstract]
Contract manufacturing revenues from former parent	$ 47
Purchases of Alcon from former parent	$ 19

X

- 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

X

- Definition

Revenue From Contract Manufacturing, Related Party Transactions

+ References

No definition available.

+ Details

Name:	alc_RevenueFromContractManufacturingRelatedPartyTransactions
Namespace Prefix:	alc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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

Name:	ifrs-full_PurchasesOfGoodsRelatedPartyTransactions
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration