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Trade and Other Current Receivables - Additional Information (Detail) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Trade and Other Current Receivables [Line Items]      
Other receivables € 1,331 € 1,269  
Impairment provision 184 166 € 155
Current Trade Receivables [Member]      
Trade and Other Current Receivables [Line Items]      
Impairment provision 160 143  
Other Current Receivables [Member]      
Trade and Other Current Receivables [Line Items]      
Impairment provision 10 10  
Non Current Trade And Other Receivables [Member]      
Trade and Other Current Receivables [Line Items]      
Impairment provision 14 13  
Financial asset [member]      
Trade and Other Current Receivables [Line Items]      
Other receivables 281 396  
Non financial asset [member]      
Trade and Other Current Receivables [Line Items]      
Other receivables € 1,050 € 873