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Employees - Schedule of Charges Related to Equity-Settled Plans (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of share based compensation plans [Line Items]      
Income statement charge € (284) € (198) € (150)
Performance share plans [member]      
Disclosure of share based compensation plans [Line Items]      
Income statement charge (273) (185) (143)
Other plans [member]      
Disclosure of share based compensation plans [Line Items]      
Income statement charge € (11) € (13) € (7)