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Related party transactions - GLT (Details) - Group Leadership Team - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Related party transactions      
Short-term benefits € 22 € 26 € 9
Post-employment benefits 1 1 1
Share-based payment 7 15 9
Termination benefits 4 1 3
Total € 34 € 43 € 22