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Financial expenses and income (Details) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of detailed information about finance income expense [Line Items]
Cost of debt	€ (555)	€ (365)	€ (313)
Interest income	533	241	54
Cost of net debt	(22)	(124)	(259)
Non-operating foreign exchange gains/(losses)	(2)	(4)	2
Unwinding of discounting of provisions	(59)	(20)	(11)
Net interest cost related to employee benefits	(73)	(47)	(44)
Gains/(losses) on disposals of financial assets	(1)	1	3
Net interest expense on lease liabilities	(39)	(40)	(35)
Other	(526)	0	16
Net financial income/(expenses)	(722)	(234)	(328)
Financial expenses	(1,313)	(440)	(368)
Financial income	591	206	40
Liability recognised for estimated future royalties	(541)	0	0
Interest rate and currency derivatives used to hedge debt
Disclosure of detailed information about finance income expense [Line Items]
Gain on derivatives used to manage debt	(67)	(11)	14
Gain on derivatives used to manage cash and cash equivalents	€ (13)	€ 68	€ 51

X

- Definition

The amount of expense recognised due to the unwinding of the discount on provisions other than provisions for employee benefits, resulting from the effect of the passage of time. [Refer: Other provisions]

+ References

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- Definition

The amount of costs associated with financing activities of the entity.

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- Definition

The amount of income associated with interest and other financing activities of the entity.

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The amount of income or cost associated with interest and other financing activities of the entity.

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- Definition

The gains (losses) on available-for-sale financial assets. [Refer: Financial assets available-for-sale]

+ References

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-Note Expired 2023-01-01
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- Definition

The amount of interest expense on borrowings. [Refer: Interest expense; Borrowings]

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- Definition

The amount of interest expense on lease liabilities. [Refer: Lease liabilities]

+ References

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-IssueDate 2023-01-01
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- Definition

The amount of finance income or cost that the entity does not separately disclose in the same statement or note. [Refer: Finance income (cost)]

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- Definition

Cost of debt net.

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Gain on derivatives used to manage cash and cash equivalents.

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Gain derivatives used to manage debt.

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Interest Income

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Liability Recognised For Estimated Future Royalties

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Net interest cost related to employee benefits.

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Non-operating foreign exchange gains/(losses).

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