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Other Non-Current Assets - Movements in Interest in Joint Ventures and Associates (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Joint Ventures And Associates [Line Items]    
Beginning balance € 718  
Ending balance 557 € 718
Associates [Member]    
Disclosure Of Joint Ventures And Associates [Line Items]    
Beginning balance 51 59
Additions 5 7
Dividend received/reductions (10) (8)
Share of net profit/(loss)   (3)
Currency retranslation (2) (4)
Ending balance 44 51
Joint ventures [Member]    
Disclosure Of Joint Ventures And Associates [Line Items]    
Beginning balance 36 48
Additions   24
Dividend received/reductions (155) (151)
Share of net profit/(loss) 155 130
Currency retranslation (4) (15)
Ending balance € 32 € 36