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Personnel costs - Summary of Personal Costs (Details) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Employee Benefits [Abstract]
Salaries	€ 7,183	€ 7,145	€ 6,625
Social security charges (including defined-contribution pension plans)	2,100	2,098	1,929
Other employee expense	531	748	786
Total	€ 9,814	€ 9,991	€ 9,340

X

- Definition

The expense of all forms of consideration given by an entity in exchange for a service rendered by employees or for the termination of employment.

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- Definition

The amount of employee expenses that the entity does not separately disclose in the same statement or note.

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- Definition

A class of employee benefits expense that represents social security contributions. [Refer: Employee benefits expense]

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A class of employee benefits expense that represents wages and salaries. [Refer: Employee benefits expense]

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Employee Benefits [Abstract]

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