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Intangible assets other than goodwill (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($)
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Impairment of intangibles | $ 61 | $ 0 | $ 61 | $ 45
Discount rate, measurement input | Intangible assets |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Significant unobservable input, assets | 0.078 |  | 0.078 |
Surgical |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Recoverable amount of CGU | $ 15 |  | $ 15 |
Surgical | Cost of net sales |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Impairment of intangibles | 59 |  | 59 |
Vision Care |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Recoverable amount of CGU |  | $ 48 |  | 48
Vision Care | Cost of net sales |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Impairment of intangibles |  |  |  | $ 45
Vision Care | Research and development |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Impairment of intangibles | $ 2 |  | $ 2 |

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