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Share Capital - Schedule of Share Capital (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of classes of share capital [line items]    
Beginning balance 134,510,623  
New shares issued 1,488,771  
Ending balance 135,999,394 134,510,623
Beginning balance € (319) € (570)
New shares issued   259
Ending balance (114) (319)
Share capital [member]    
Disclosure of classes of share capital [line items]    
Beginning balance 3 2
New shares issued 0 1
Ending balance 3 3
Share premium [member]    
Disclosure of classes of share capital [line items]    
Beginning balance 420 162
New shares issued 0 258
Ending balance € 420 € 420