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Costs (Details 2) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Operating Expenses [Line Items]      
Payroll and related costs € 3,093 € 2,951 € 2,994
Payroll and related costs [Member]      
Disclosure Of Operating Expenses [Line Items]      
Wages and salaries 2,409 2,447 2,491
Social security contributions 448 441 445
Cost related to employee benefit plans 220 113 81
Other costs 170 162 202
Short-term employee benefits expense 3,247 3,163 3,219
capitalized direct costs associated with self-constructed assets - tangible assets (142) (202) (215)
capitalized direct costs associated with self-constructed assets - intangible assets (12) (10) (10)
Payroll and related costs € 3,093 € 2,951 € 2,994