XML 202 R165.htm IDEA: XBRL DOCUMENT v3.8.0.1
Related Parties - Summary of Key Management Personnel Compensation (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of transactions between related parties [abstract]      
Short term employee benefits € 8 € 10 € 8
Directors' fees 1 1 1
Share-based compensation 4 2 2
Post-employments benefits     1
Termination benefits 1 1 1
Employer social contribution 1 2 1
Total € 15 € 16 € 14