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Debt, cash and cash equivalents and lease liabilities - Lease Liabilities (Details) - EUR (€) € in Millions	1 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of maturity analysis of finance lease payments receivable [line items]
Lease liabilities		€ 2,030	€ 2,181	€ 2,108
Discounting effect		€ (58)	(219)	(228)
Cambridge, Massachusetts
Disclosure of maturity analysis of finance lease payments receivable [line items]
Initial lease term	15 years	15 years
Less than 1 year
Disclosure of maturity analysis of finance lease payments receivable [line items]
Lease liabilities		€ 291	320	314
From 1 to 3 years
Disclosure of maturity analysis of finance lease payments receivable [line items]
Lease liabilities		448	515	476
From 3 to 5 years
Disclosure of maturity analysis of finance lease payments receivable [line items]
Lease liabilities		360	436	362
More than 5 years
Disclosure of maturity analysis of finance lease payments receivable [line items]
Lease liabilities		€ 989	€ 1,129	€ 1,184

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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No definition available.

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- Definition

The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2023-01-01
-Paragraph 47
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- Definition

Initial Lease Term

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- Definition

Lease Liabilities, Effect Of Discounting

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