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Right-of-use assets and Lease liabilities - Reconciliation of Lease Commitments (Details) - USD ($) $ in Millions	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease commitments			$ (222)
Effect of discounting			(21)
Operating leases discounted using the incremental borrowing rate			201
Finance lease liabilities			$ 89
Recognition exemption for short term and low-value leases		$ (4)
Lease liabilities	$ 341	$ 286
Weighted average lessee's incremental borrowing rate applied to lease liabilities recognised at date of initial application of IFRS 16		2.90%

X

- Definition

Effect Of Discounting On Minimum Lease Payments Payable Under Noncancellable Operating Lease

+ References

No definition available.

+ Details

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Namespace Prefix:	alc_
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Balance Type:	debit
Period Type:	instant

X

- Definition

Leases [Abstract]

+ References

No definition available.

+ Details

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

X

- Definition

Minimum Finance Lease Payments Payable, Net

+ References

No definition available.

+ Details

Name:	alc_MinimumFinanceLeasePaymentsPayableNet
Namespace Prefix:	alc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Minimum Lease Payments Payable Under Noncancellable Operating Lease, Gross

+ References

No definition available.

+ Details

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Namespace Prefix:	alc_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Minimum Lease Payments Payable Under Noncancellable Operating Lease, Net

+ References

No definition available.

+ Details

Name:	alc_MinimumLeasePaymentsPayableUnderNoncancellableOperatingLeaseNet
Namespace Prefix:	alc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of the lease commitments for short-term leases accounted for applying paragraph 6 of IFRS 16. Short-term lease is a lease that, at the commencement date, has a lease term of 12 months or less. A lease that contains a purchase option is not a short-term lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2019-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard
-URIDate 2019-03-27

+ Details

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

- Definition

The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2019-01-01
-Paragraph 47
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard
-URIDate 2019-03-27

+ Details

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Balance Type:	credit
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X

- Definition

The weighted average lessee's incremental borrowing rate applied to lease liabilities recognised in the statement of financial position at the date of initial application of IFRS 16. The incremental borrowing rate is the rate of interest that a lessee would have to pay to borrow over a similar term, and with a similar security, the funds necessary to obtain an asset of a similar value to the right-of-use asset in a similar economic environment.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2019-01-01
-Paragraph C12
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_C12_a&doctype=Appendix&subtype=C
-URIDate 2019-03-27

+ Details

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