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Remuneration of Auditors - Summary of Services from Auditors and its Associates (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Auditors Remuneration [Line Items]      
Total statutory audit fees € 14 € 14 € 14
Audit-related assurance services 0 0 0
Other taxation advisory services 0 0 0
Services relating to corporate finance transactions 0 0 0
Other assurance services 5    
Parent [Member]      
Disclosure of Auditors Remuneration [Line Items]      
Total statutory audit fees 4 4 5
Subsidiaries [Member]      
Disclosure of Auditors Remuneration [Line Items]      
Total statutory audit fees € 10 € 10 € 9