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Liabilities related to business combinations and to non-controlling interests - Additional Information (Details) - EUR (€) € in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure Of Liabilities Related To Business Combinations And To Noncontrolling Interests [line items]
Fair value of contingent consideration payable	€ 709	€ 779	€ 714	€ 605
Commitments relating to contingent consideration in connection with business combinations	€ 133	604	689
MSD contingent consideration (European vaccines business)
Disclosure Of Liabilities Related To Business Combinations And To Noncontrolling Interests [line items]
Increase in fair value of liability	1.00%
Fair value of contingent consideration payable	€ 127	204	269	312
Shire contingent consideration arising from the acquisition of Translate Bio
Disclosure Of Liabilities Related To Business Combinations And To Noncontrolling Interests [line items]
Fair value of contingent consideration payable	€ 441	380	354	0
Shire contingent consideration
Disclosure Of Liabilities Related To Business Combinations And To Noncontrolling Interests [line items]
Increase in fair value of liability	12.00%
Amunix
Disclosure Of Liabilities Related To Business Combinations And To Noncontrolling Interests [line items]
Increase in fair value of liability	1.00%
Fair value of contingent consideration payable	€ 137	€ 165	€ 0	€ 0

X

- Definition

The amount of contingent liabilities recognised in a business combination. [Refer: Contingent liabilities [member]; Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2023-01-01
-Paragraph B67
-Subparagraph c
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-URIDate 2023-03-23

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- Definition

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+ References

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Disclosure Of Liabilities Related To Business Combinations And To Noncontrolling Interests [line items]

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- Definition

Percentage increase in fair value liabilities.

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