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Financial assets and liabilities measured at fair value - Summary of Assets and Liabilities Measured at Fair Value (Details) - EUR (€) € in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Level 1 |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | € 6,737 | € 10,765 | € 6,449
Total financial liabilities measured at fair value | 0 | 0 | 0
Level 1 | Bayer contingent purchase consideration arising from the acquisition of Genzyme |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 0 | 0 | 0
Level 1 | MSD contingent consideration (European vaccines business) |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 0 | 0 | 0
Level 1 | Shire contingent consideration arising from the acquisition of Translate Bio |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 0 | 0 | 0
Level 1 | Contingent consideration arising from acquisition of Amunix |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 0 | 0 | 0
Level 1 | Other contingent consideration arising from business combinations and acquisitions |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 0 | 0 | 0
Level 1 | Non-current derivatives |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 0 | 0 | 0
Level 1 | Current derivatives |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 0 | 0 | 0
Level 1 | Quoted equity investments |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 470 | 387 | 396
Level 1 | Unquoted equity investments |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 1 | Quoted debt securities |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 346 | 329 | 447
Level 1 | Unquoted debt securities not meeting the definition of equity instruments |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 1 | Contingent consideration relating to divestments |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 1 | Financial assets held to meet obligations under deferred compensation plans |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 572 | 512 | 549
Level 1 | Non-current derivatives |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 1 | Current derivatives |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 1 | Mutual fund investments |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 5,349 | 9,537 | 5,057
Level 2 |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 201 | 206 | 298
Total financial liabilities measured at fair value | 291 | 326 | 85
Level 2 | Bayer contingent purchase consideration arising from the acquisition of Genzyme |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 0 | 0 | 0
Level 2 | MSD contingent consideration (European vaccines business) |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 0 | 0 | 0
Level 2 | Shire contingent consideration arising from the acquisition of Translate Bio |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 0 | 0 | 0
Level 2 | Contingent consideration arising from acquisition of Amunix |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 0 | 0 | 0
Level 2 | Other contingent consideration arising from business combinations and acquisitions |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 0 | 0 | 0
Level 2 | Non-current derivatives |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 164 | 232 | 6
Level 2 | Current derivatives |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 127 | 94 | 79
Level 2 | Quoted equity investments |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 2 | Unquoted equity investments |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 2 | Quoted debt securities |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 2 | Unquoted debt securities not meeting the definition of equity instruments |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 2 | Contingent consideration relating to divestments |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 2 | Financial assets held to meet obligations under deferred compensation plans |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 2 | Non-current derivatives |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 3
Level 2 | Current derivatives |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 201 | 206 | 295
Level 2 | Mutual fund investments |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 3 |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 964 | 967 | 883
Total financial liabilities measured at fair value | 709 | 779 | 714
Level 3 | Bayer contingent purchase consideration arising from the acquisition of Genzyme |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 0 | 26 | 59
Level 3 | MSD contingent consideration (European vaccines business) |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 127 | 204 | 269
Level 3 | Shire contingent consideration arising from the acquisition of Translate Bio |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 441 | 380 | 354
Level 3 | Contingent consideration arising from acquisition of Amunix |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 137 | 165 | 0
Level 3 | Other contingent consideration arising from business combinations and acquisitions |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 4 | 4 | 32
Level 3 | Non-current derivatives |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 0 | 0 | 0
Level 3 | Current derivatives |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 0 | 0 | 0
Level 3 | Quoted equity investments |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 3 | Unquoted equity investments |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 618 | 549 | 427
Level 3 | Quoted debt securities |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 3 | Unquoted debt securities not meeting the definition of equity instruments |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 132 | 115 | 78
Level 3 | Contingent consideration relating to divestments |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 214 | 303 | 378
Level 3 | Financial assets held to meet obligations under deferred compensation plans |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 3 | Non-current derivatives |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 3 | Current derivatives |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 3 | Mutual fund investments |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | € 0 | € 0 | € 0

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