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Liabilities Related to Business Combinations and to Non-Controlling Interests - Summary of Movements in Liabilities Related to Business Combinations and to Non-Controlling Interests (Details) - EUR (€) € in Millions	6 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Changes In Liabilities Related To Business Combinations And Non-Controlling Interests [Roll Forward]
Beginning balance	€ 779
Payments made	(88)
Fair value remeasurements through profit or loss: (gain)/loss (including unwinding of discount)	36
Currency translation differences	(10)
Ending balance	717
Current portion	154	€ 105
Non-current portion	563	€ 674
Bayer contingent consideration arising from acquisition of Genzyme
Changes In Liabilities Related To Business Combinations And Non-Controlling Interests [Roll Forward]
Beginning balance	26
Payments made	(11)
Fair value remeasurements through profit or loss: (gain)/loss (including unwinding of discount)	(2)
Currency translation differences	0
Ending balance	13
MSD contingent consideration (European Vaccines business)
Changes In Liabilities Related To Business Combinations And Non-Controlling Interests [Roll Forward]
Beginning balance	204
Payments made	(77)
Fair value remeasurements through profit or loss: (gain)/loss (including unwinding of discount)	6
Currency translation differences	0
Ending balance	133
Shire contingent consideration arising from acquisition of Translate Bio
Changes In Liabilities Related To Business Combinations And Non-Controlling Interests [Roll Forward]
Beginning balance	380
Payments made	0
Fair value remeasurements through profit or loss: (gain)/loss (including unwinding of discount)	15
Currency translation differences	(6)
Ending balance	389
Contingent consideration arising from acquisition of Amunix
Changes In Liabilities Related To Business Combinations And Non-Controlling Interests [Roll Forward]
Beginning balance	165
Payments made	0
Fair value remeasurements through profit or loss: (gain)/loss (including unwinding of discount)	17
Currency translation differences	(4)
Ending balance	178
Other
Changes In Liabilities Related To Business Combinations And Non-Controlling Interests [Roll Forward]
Beginning balance	4
Payments made	0
Fair value remeasurements through profit or loss: (gain)/loss (including unwinding of discount)	0
Currency translation differences	0
Ending balance	€ 4

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 2022-03-24
-Paragraph B67
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2022-en-r&anchor=para_B67_c&doctype=Appendix&subtype=B
-URIDate 2022-03-24

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- Definition

The gains (losses) including exchange differences recognised in profit or loss on the fair value measurement of liabilities. [Refer: At fair value [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2022-03-24
-Paragraph 93
-Subparagraph e
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2022-en-r&anchor=para_93_e_i&doctype=Standard
-URIDate 2022-03-24

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- Definition

The amount of contingent liabilities recognised in a business combination that were settled. [Refer: Contingent liabilities recognised in business combination]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2022-03-24
-Paragraph B67
-Subparagraph c
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- Definition

Changes In Liabilities Related To Business Combinations And Non-Controlling Interests [Roll Forward]

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- Definition

This account includes current portion of contingent considerations that satisfy the recognition criteria of IFRS 3 Business combinations, measured initially at their fair value as at the date of acquisition. This account also includes current portion of liabilities related to non-controlling interests.

+ References

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No definition available.

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