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Accounting Information and Policies - Additional Information (Detail)
€ in Millions
 12 Months Ended
Dec. 31, 2017
EUR (€)
Spreads business [member]  
Disclosure of summary of significant accounting policies [line items]  
Contribution to group turnover percentage 6.00%
Contribution to group net assets percentage 2.00%
IFRS 16 [member]  
Disclosure of summary of significant accounting policies [line items]  
Operating lease commitments € 2,500
IFRS 9 [member]  
Disclosure of summary of significant accounting policies [line items]  
Financial assets previously measured at fair value through equity measured at amortised cost € 120