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Other notes - Financial risk management, credit risk, narrative (Details) - Credit risk - Trade receivables
€ in Millions
Dec. 31, 2017
EUR (€)
customer
category
Dec. 31, 2016
customer
Disclosure of credit risk exposure [line items]    
Number of credit risk categories | category 3  
More Than One Million    
Disclosure of credit risk exposure [line items]    
Risk exposure associated with instruments sharing characteristic, number of customers | customer 44 37
Risk exposure associated with instruments sharing characteristic | € € 1  
Risk exposure associated with instruments sharing characteristic, concentration risk percentage 53.00% 56.00%
More Than Five Million    
Disclosure of credit risk exposure [line items]    
Risk exposure associated with instruments sharing characteristic, number of customers | customer 3 3
Risk exposure associated with instruments sharing characteristic | € € 5  
Risk exposure associated with instruments sharing characteristic, concentration risk percentage 11.00% 17.00%