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Significant transactions (Details) - USD ($) $ in Millions |  |  |  |  |  |  | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 24, 2025 | Mar. 23, 2025 | Jan. 16, 2025 | Jan. 15, 2025 | Oct. 17, 2024 | Jul. 01, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 9,181 |  | $ 8,946
Cash paid for the acquisition |  |  |  |  |  |  | $ 568 | $ 0 |
Aurion Biotech, Inc. |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Ownership percentage in subsidiary | 99.00% |  |  |  |  |  |  |  |
Ownership percentage in subsidiary on a fully diluted basis | 85.00% |  |  |  |  |  | 91.20% |  |
Ownership percentage in subsidiary held by non-controlling interests on a fully diluted basis | 15.00% |  |  |  |  |  | 8.80% |  |
Divestment of product rights and out-licensing in China |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Up-front consideration |  |  |  |  | $ 116 |  |  |  |
Up-front consideration (in percentage) |  |  |  |  | 16.70% |  |  |  |
Aurion Biotech, Inc. |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Investment ownership percentage |  | 40.30% |  |  |  |  |  |  |
Cylite Pty Ltd. |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Investment ownership percentage |  |  |  | 8.80% |  |  |  |  |
Ownership percentage in subsidiary |  |  | 100.00% |  |  |  |  |  |
Aurion Biotech, Inc. |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Percentage of outstanding shares acquired | 58.70% |  |  |  |  |  |  |  |
Total acquisition date fair value of consideration | $ 486 |  |  |  |  |  |  |  |
Previously-held commercialization rights in intangible assets | 36 |  |  |  |  |  |  |  |
Cash paid at closing | 522 |  |  |  |  |  | $ 522 |  |
Goodwill | 140 |  |  |  |  |  | $ 140 |  |
Cash paid for the acquisition | $ 496 |  |  |  |  |  |  |  |
Cylite Pty Ltd. |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Percentage of outstanding shares acquired |  |  | 91.20% |  |  |  |  |  |
Total acquisition date fair value of consideration |  |  | $ 123 |  |  |  |  |  |
Cash paid at closing |  |  | 78 |  |  |  |  |  |
Goodwill |  |  | 90 |  |  |  |  |  |
Cash paid for the acquisition |  |  | $ 72 |  |  |  |  |  |
BELKIN Vision Ltd. |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Percentage of outstanding shares acquired |  |  |  |  |  | 100.00% |  |  |
Goodwill |  |  |  |  |  | $ 20 |  |  |
Cash paid for the acquisition |  |  |  |  |  | $ 61 |  |  |

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