The amount of outstanding funds that the entity is obligated to repay.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_Borrowings
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2024-01-01
-Paragraph 7
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_7&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_BorrowingsInterestRate
Namespace Prefix:	ifrs-full_
Data Type:	dtr-2022:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount of current borrowings and current portion of non-current borrowings. [Refer: Borrowings]

+ References

+ Details

Name:	ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The non-current portion of non-current borrowings. [Refer: Borrowings]

+ References

+ Details

Name:	ifrs-full_LongtermBorrowings
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	ifrs-full_BorrowingsByNameAxis=alc_LocalFacilitiesJapanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=alc_SeniorNotesDue2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=alc_SeniorNotesDue2028Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=alc_SeniorNotesDue2029Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=alc_SeniorNotesDue2030Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=alc_SeniorNotesDue2032Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=alc_SeniorNotesDue2049Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=alc_SeniorNotesDue2052Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=alc_RevolvingFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=alc_LocalFacilitiesOtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=alc_OtherShorttermFinancialDebtsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=ifrs-full_DerivativesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Non-current and current financial debts - Schedule of financial debts (Details) $ in Millions, ¥ in Billions	Jun. 30, 2025 USD ($)	Jan. 20, 2025 USD ($)	Jan. 20, 2025 JPY (¥)	Dec. 31, 2024 USD ($)
Disclosure of detailed information about borrowings [line items]
Total non-current financial debts	$ 4,664			$ 4,538
Total current financial debts	81			105
Total financial debts	4,745			4,643
Local facilities (Japan), floating rate debt due 2028
Disclosure of detailed information about borrowings [line items]
Total non-current financial debts	57			0
Total current financial debts	$ 0			26
Total financial debts		$ 64	¥ 10
Series 2026 Notes
Disclosure of detailed information about borrowings [line items]
Borrowings, interest rate	2.75%
Total non-current financial debts	$ 499			499
Series 2028 Notes
Disclosure of detailed information about borrowings [line items]
Borrowings, interest rate	2.375%
Total non-current financial debts	$ 584			517
Series 2029 Notes
Disclosure of detailed information about borrowings [line items]
Borrowings, interest rate	3.00%
Total non-current financial debts	$ 996			995
Series 2030 Notes
Disclosure of detailed information about borrowings [line items]
Borrowings, interest rate	2.60%
Total non-current financial debts	$ 747			746
Series 2032 Notes
Disclosure of detailed information about borrowings [line items]
Borrowings, interest rate	5.375%
Total non-current financial debts	$ 694			694
Series 2049 Notes
Disclosure of detailed information about borrowings [line items]
Borrowings, interest rate	3.80%
Total non-current financial debts	$ 495			495
Series 2052 Notes
Disclosure of detailed information about borrowings [line items]
Borrowings, interest rate	5.75%
Total non-current financial debts	$ 592			592
Revolving facility, floating rate due 2029
Disclosure of detailed information about borrowings [line items]
Total non-current financial debts	0			0
All others
Disclosure of detailed information about borrowings [line items]
Total current financial debts	61			67
Other short-term financial debts, floating rate
Disclosure of detailed information about borrowings [line items]
Total current financial debts	10			8
Derivatives
Disclosure of detailed information about borrowings [line items]
Total current financial debts	$ 10			$ 4