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Debt, cash and cash equivalents and lease liabilities - Summary of Changes in Financial Position (Details) - EUR (€) € in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Financial Instruments [Abstract]
Long-term debt	€ 14,347	€ 14,857	€ 17,123
Short-term debt and current portion of long-term debt	2,045	4,174	3,183
Interest rate and currency derivatives used to manage debt	139	187	(56)
Total debt	16,531	19,218	20,250	€ 22,631
Cash and cash equivalents	(8,710)	(12,736)	(10,098)	€ (13,915)
Interest rate and currency derivatives used to manage cash and cash equivalents	(28)	(45)	(169)
Net debt	7,793	6,437	9,983
Lease liabilities	€ 2,030	€ 2,181	€ 2,108

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- Definition

The amount of outstanding funds that the entity is obligated to repay.

+ References

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The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

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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.

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Debt net of cash and cash equivalents.

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Financial Instruments [Abstract]

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Interest rate and currency derivatives used to manage cash and cash equivalent.

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