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Intangible assets other than goodwill (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disclosure of detailed information about intangible assets [line items]
Impairment of intangibles	$ 41		$ 0	$ 57	$ 0
Vision Care
Disclosure of detailed information about intangible assets [line items]
Recoverable amount of CGU	$ 88			$ 88
Surgical
Disclosure of detailed information about intangible assets [line items]
Impairment of intangibles		$ 16

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- Definition

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

+ References

No definition available.

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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 2019-01-01
-Paragraph 118
-Subparagraph e
-Clause iv
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-URIDate 2019-03-27

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- Definition

The higher of an asset’s (or cash-generating unit’s) fair value less costs of disposal and its value in use. [Refer: Cash-generating units [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 36
-IssueDate 2019-01-01
-Paragraph 130
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2019-en-r&anchor=para_130_e&doctype=Standard
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