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Intangible assets other than goodwill (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Impairment of intangibles | $ 0 | $ 41 |  | $ 45 | $ 57
Vision Care |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Impairment of intangibles |  | 41 |  | 45 |
Recoverable amount of CGU | $ 48 | $ 88 |  | $ 48 | $ 88
Surgical |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Impairment of intangibles |  |  | $ 16 |  |

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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 2020-01-01 -Paragraph 118 -Subparagraph e -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e_iv&doctype=Standard -URIDate 2020-01-01 + Details
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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 -Name IAS -Number 36 -IssueDate 2020-01-01 -Paragraph 130 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2020-en-r&anchor=para_130_e&doctype=Standard -URIDate 2020-01-01 + Details
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