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Share Capital - Schedule of Share Capital (Detail)
€ in Millions
6 Months Ended
Jun. 30, 2018
EUR (€)
shares
Disclosure of classes of share capital [line items]  
Beginning balance | shares 134,510,623
Beginning balance € (319)
New shares issued | shares 182,716
Ending balance | shares 134,693,339
Ending balance € (272)
Share capital [member]  
Disclosure of classes of share capital [line items]  
Beginning balance 3
New shares issued 0
Ending balance 3
Share premium [member]  
Disclosure of classes of share capital [line items]  
Beginning balance 420
New shares issued 0
Ending balance € 420