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Share Capital - Schedule of Share Capital (Detail)
€ in Millions
12 Months Ended
Dec. 31, 2017
EUR (€)
shares
Disclosure of classes of share capital [line items]  
Beginning balance | shares 105,581,673
New shares issued | shares 28,928,950
Ending balance | shares 134,510,623
Beginning balance € (570)
Ending balance (319)
Share capital [member]  
Disclosure of classes of share capital [line items]  
Beginning balance 2
New shares issued 1
Ending balance 3
Share premium [member]  
Disclosure of classes of share capital [line items]  
Beginning balance 162
New shares issued 258
Ending balance € 420