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Remuneration of Auditors - Summary of Services from Auditors and its Associates (Parenthetical) (Detail) - EUR (€)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Auditors Remuneration [Line Items]      
Total statutory audit fees € 16,000,000 € 14,000,000 € 14,000,000
Review of spreads carve-out accounts [member]      
Disclosure of Auditors Remuneration [Line Items]      
Auditor remuneration for audits and reviews of spreads carve out financial statements 4,000,000 5,000,000  
Work on simplification [member]      
Disclosure of Auditors Remuneration [Line Items]      
Assurance work on simplification 1,000,000 0  
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
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 € 5,000,000 € 4,000,000 € 3,000,000