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Provisions, income tax liabilities and other liabilities - Summary of Non Current Provisions and Other Non-current Liabilities (Details) - EUR (€) € in Millions | Dec. 31, 2023 | Apr. 09, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure Of Non-current Provisions [line items] |  |  |  |  |
Provisions | € 5,262 |  | € 5,822 | € 6,430 | € 6,998
Other non-current liabilities | 2,340 |  | 519 | 291 |
Total | 7,602 |  | 6,341 | 6,721 |
Non-current liabilities | 164 |  | € 232 | € 6 |
Antibodies Collaboration agreement | Swedish Orphan Biovitrum AB |  |  |  |  |
Disclosure Of Non-current Provisions [line items] |  |  |  |  |
Other non-current liabilities | 1,960 | € 1,600 |  |  |
Antibodies Collaboration agreement | Swedish Orphan Biovitrum AB | Later than one year and not later than five years |  |  |  |  |
Disclosure Of Non-current Provisions [line items] |  |  |  |  |
Other non-current liabilities | 1,112 |  |  |  |
Antibodies Collaboration agreement | Swedish Orphan Biovitrum AB | More than 5 years |  |  |  |  |
Disclosure Of Non-current Provisions [line items] |  |  |  |  |
Other non-current liabilities | € 2,860 |  |  |  |

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