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Costs (Details 4) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Costs |  |  |
Wages and salaries | € 25 | € 26 | € 26
Post-employment benefits | 2 | 2 | 2
Other long-term benefits | 9 | 12 | 12
Indemnities upon termination of employment | 7 | 4 | 2
Key management personnel compensation | € 43 | € 44 | € 42

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