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Goodwill and other intangible assets - Intangible asset impairment charges (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Jun. 30, 2022	Sep. 30, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of detailed information about intangible assets [line items]
Impairment charges	$ 61		$ 0	$ 62	$ 225
Surgical
Disclosure of detailed information about intangible assets [line items]
Impairment charges		$ 178	0	60
Vision Care
Disclosure of detailed information about intangible assets [line items]
Impairment charges			$ 0	$ 2	$ 47

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- 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

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- Definition

The amount of impairment loss recognised in profit or loss for intangible assets other than goodwill. [Refer: Impairment loss recognised in profit or loss; Intangible assets other than goodwill]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 38
-IssueDate 2023-01-01
-Paragraph 118
-Subparagraph e
-Clause iv
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2023-en-r&anchor=para_118_e_iv&doctype=Standard
-URIDate 2023-03-23

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