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Goodwill and intangible assets - Intangible asset impairment charges (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2020
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Impairment charges |  | $ 167,000,000 | $ 0 | $ 378,000,000 |
Cash flow projection forecast duration |  | 5 years |  |  |
Cost of net sales [member] |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Impairment charges |  | $ 106,000,000 |  |  |
Surgical [member] |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Impairment charges |  | 66,000,000 | 0 | 378,000,000 |
Recoverable amount |  | 65,000,000 |  |  |
Surgical [member] | Currently marketed products [member] |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Impairment charges |  | 65,000,000 |  |  |
Surgical [member] | CyPass [member] |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Impairment charges |  |  |  | (337,000,000) |
Surgical [member] | Optonol Ltd. [member] |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Impairment charges |  |  |  | (39,000,000) |
Vision Care [member] |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Impairment charges |  | 101,000,000 | $ 0 | $ 0 |
Vision Care [member] | Cost of net sales [member] |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Impairment charges |  | $ 41,000,000 |  |  |
Recoverable amount |  |  |  |  | $ 88,000,000
Vision Care and Surgical |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Impairment charges | $ 61,000,000 |  |  |  |

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- Definition Intangible Assets, Cash Flow Projection Forecast Duration + References No definition available. + Details
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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. + 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 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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- Details
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- Details
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