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Fair value of financial assets and liabilities - Financial assets 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 assets € 78 € 160
Net amounts of financial assets presented in the balance sheet 78 160
Related amounts not offset in the balance sheet [Abstract]    
Financial instruments (38) (92)
Net amount € 39 € 68