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Right-of-use assets and Lease liabilities - Additional Disclosures Related to Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Interest expense on lease liabilities	$ 13	$ 11	$ 5
Expense on short-term, low value and variable leases	4	3
Total cash outflows for leases	85	59
Lease liability payments	69	52	$ 0
Interest payments	12	5
Short-term and low value lease payments	$ 4	$ 2

X

- Definition

Expense Relating To Short-Term, Low Value and Variable Leases For Which Recognition Exemption Has Been Used

+ References

No definition available.

+ Details

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Namespace Prefix:	alc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Leases [Abstract]

+ References

No definition available.

+ Details

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Namespace Prefix:	alc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Payment Of Short-term And Low Value Leases, Classified As Operating Activities

+ References

No definition available.

+ Details

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

X

- Definition

Payments Of Interest On Leases, Classified As Operating Activities

+ References

No definition available.

+ Details

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

X

- Definition

The cash outflow for leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2020-01-01
-Paragraph 53
-Subparagraph g
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_g&doctype=Standard
-URIDate 2020-01-01

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of interest expense on lease liabilities. [Refer: Lease liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2020-01-01
-Paragraph 53
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_b&doctype=Standard
-URIDate 2020-01-01

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Balance Type:	debit
Period Type:	duration

X

- Definition

The cash outflow for payment of lease liabilities, classified as financing activities. [Refer: Lease liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 7
-IssueDate 2020-01-01
-Paragraph 17
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_17_e&doctype=Standard
-URIDate 2020-01-01

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