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Significant transactions (Details) $ / shares in Units, € in Millions, $ in Millions |  |  |  |  |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 06, 2022 USD ($) | Nov. 21, 2022 USD ($) $ / shares | Jul. 08, 2022 USD ($) | May 31, 2022 USD ($) | May 31, 2022 EUR (€) | Jan. 07, 2022 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) | May 31, 2022 EUR (€)
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Cash paid for the acquisition |  |  |  |  |  |  | $ 0 | $ 483 |  |
Goodwill |  |  |  |  |  |  | 8,970 |  | $ 8,970 |
Financial debts |  |  |  |  |  |  | 4,681 |  | $ 4,648 |
Repayments of non-current borrowings |  |  |  |  |  |  | $ 0 | $ 536 |  |
Aerie |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Percentage of outstanding shares acquired |  | 100.00% |  |  |  |  |  |  |  |
Price paid (in dollars per share) | $ / shares |  | $ 15.25 |  |  |  |  |  |  |  |
Consideration transferred |  | $ 744 |  |  |  |  |  |  |  |
Cash paid for the acquisition |  | 666 |  |  |  |  |  |  |  |
Borrowings recognised as of acquisition date |  | 316 |  |  |  |  |  |  |  |
Goodwill |  | $ 65 |  |  |  |  |  |  |  |
Eysuvis and Inveltys |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Upfront payment |  |  | $ 60 |  |  |  |  |  |  |
Inventory, net of liabilities |  |  | 14 |  |  |  |  |  |  |
Purchase consideration |  |  | 79 |  |  |  |  |  |  |
Intangible assets |  |  | $ 71 |  |  |  |  |  |  |
Ivantis, Inc. |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Percentage of outstanding shares acquired |  |  |  |  |  | 100.00% |  |  |  |
Upfront payment |  |  |  |  |  | $ 479 |  |  |  |
Series 2032 Notes |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Financial debts | $ 700 |  |  |  |  |  |  |  |  |
Borrowings, interest rate | 5.375% |  |  |  |  |  | 5.375% |  |  |
Series 2052 Notes |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Financial debts | $ 600 |  |  |  |  |  |  |  |  |
Borrowings, interest rate | 5.75% |  |  |  |  |  | 5.75% |  |  |
Facility B Term Loan |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Repayments of non-current borrowings | $ 640 |  |  |  | € 160 |  |  |  |  |
Bridge Loan Facility |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Repayments of non-current borrowings | $ 775 |  |  |  |  |  |  |  |  |
Series 2028 Notes |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Financial debts |  |  |  | $ 537 |  |  |  |  |  | € 500
Borrowings, interest rate |  |  |  | 2.375% |  |  | 2.375% |  |  | 2.375%
Facility C Term Loan |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Repayments of non-current borrowings |  |  |  | $ 376 | € 350 |  |  |  |  |

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