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Costs - Payroll and related costs (Details) - EUR (€) € in Millions | 12 Months Ended
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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 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. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 102 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_102&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_99&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 104 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_104&doctype=Standard -URIDate 2020-01-01 + Details
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