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Costs - Payroll and related costs (Details) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Costs
Wages and salaries	€ 2,193	€ 2,417	€ 2,409
Social security contributions	458	449	448
Cost related to employee benefit plans	102	85	220
Other costs	239	213	170
Payroll and related costs gross	2,992	3,164	3,247
Capitalized direct costs associated with self-constructed assets - tangible assets	(118)	(152)	(142)
Capitalized direct costs associated with self-constructed assets - intangible assets	(11)	(16)	(12)
Payroll and related costs	€ 2,863	€ 2,996	€ 3,093

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- Definition

Capitalized direct costs associated with self-constructed assets intangible assets in relation to payroll

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Capitalized direct costs associated with self-constructed assets tangible assets in relation to payroll

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The amount of payroll and related costs gross.

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- Definition

The amount of payroll and related costs related to benefit plans.

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

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