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Fair value of financial assets and liabilities - Financial liabilities subject to offsetting (Detail) - Derivatives [Member] - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of fair value of financial assets and liabilities [Line items]    
Gross amounts of recognised financial liabilities € (383) € (873)
Net amounts of financial liabilities presented in the balance sheet (383) (873)
Related amounts not offset in the balance sheet [Abstract]    
Financial instruments 38 92
Net amount € (345) € (781)