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Remuneration of Auditors - Summary of Services from Auditors and its Associates (Parenthetical) (Detail) - EUR (€)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Auditors Remuneration [Line Items]      
Total statutory audit fees € 14,000,000 € 14,000,000 € 14,000,000
Top of range [member]      
Disclosure of Auditors Remuneration [Line Items]      
Services supplied to associated pension schemes 1,000,000 1,000,000 1,000,000
Amount paid in relation to each type of non-statutory audit services 1,000,000 1,000,000 1,000,000
Spreads [Member]      
Disclosure of Auditors Remuneration [Line Items]      
Services relating to corporate finance transactions portion subject to tax 5,000,000    
KPMG Accountants N.V. [Member]      
Disclosure of Auditors Remuneration [Line Items]      
Total statutory audit fees 1,000,000 1,000,000 1,000,000
KPMG LLP [Member]      
Disclosure of Auditors Remuneration [Line Items]      
Total statutory audit fees € 4,000,000 € 3,000,000 € 4,000,000