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Receivables - Text details (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Receivables [Line items]      
Current trade receivables € 3,609 € 4,992  
Other current receivables 278    
Financial assets individually assessed for credit losses [Member]      
Receivables [Line items]      
Allowance account for credit losses of financial assets 197 289 € 272
Diagnosis & Treatment [Member]      
Receivables [Line items]      
Customer financing 47 47  
Current trade receivables 1,489 1,476  
Legacy items US [Member]      
Receivables [Line items]      
Insurance receivables 47 € 55  
Investment in associates [Member]      
Receivables [Line items]      
Other current receivables € 22