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Risk management - Aging of receivables (Details) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Aging of receivables    
Financial assets € 16,493 € 17,888
Trade receivables    
Aging of receivables    
Financial assets 6,880 6,972
Trade receivables | Credit risk    
Aging of receivables    
Financial assets 278 466
Trade receivables | Past due 1-30 days | Credit risk    
Aging of receivables    
Financial assets 67 102
Trade receivables | Past due 31-180 days | Credit risk    
Aging of receivables    
Financial assets 94 141
Trade receivables | More than 180 days | Credit risk    
Aging of receivables    
Financial assets € 117 € 223