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Trade Receivables and Other - Summary of Ageing of Total Trade Receivables - Net (Detail) - EUR (€)
€ in Millions
Jun. 30, 2018
Dec. 31, 2017
Trade receivables [line items]    
Trade receivables-net € 526 € 306
Current [member]    
Trade receivables [line items]    
Trade receivables-net 505 286
Past Due 1 to 30 Days [member]    
Trade receivables [line items]    
Trade receivables-net 17 13
Past Due 31 to 60 Days [member]    
Trade receivables [line items]    
Trade receivables-net 2 2
Past Due 61 to 90 Days [member]    
Trade receivables [line items]    
Trade receivables-net 0 3
Past Due Greater Than91 Days [member]    
Trade receivables [line items]    
Trade receivables-net € 2 € 2