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Risk management - Trading Market Risk - VaR (Details)
€ in Millions
 12 Months Ended
Dec. 31, 2017
EUR (€)
item
Dec. 31, 2016
EUR (€)
Dec. 31, 2015
EUR (€)
Weighted average      
Main market risk metric      
VaR € 21.5    
Trading market risk      
Main market risk metric      
VaR € 10.2 € 17.9 € 13.6
Comparison period 2 years    
ES € 11.5    
VaR confidence level, percent 99.00%    
ES confidence level, percent 97.50%    
Time horizon 1 day    
Number of exceptions for VaE | item 2    
VaE confidence level, percent 99.00%    
Trading market risk | Minimum      
Main market risk metric      
VaR € 9.7 11.1  
Trading market risk | Weighted average      
Main market risk metric      
VaR 21.5 18.3 15.6
Trading market risk | Maximum      
Main market risk metric      
VaR 63.2 32.9  
Trading market risk | Hedge funds      
Main market risk metric      
VaR 32.6    
Trading market risk | Monolines      
Main market risk metric      
VaR 27.3    
Diversification effect      
Main market risk metric      
VaR (7.6) (9.6) (5.8)
ES (7.9)    
Diversification effect | Minimum      
Main market risk metric      
VaR (2.1)    
Diversification effect | Weighted average      
Main market risk metric      
VaR (8.0) (10.3) (11.1)
Diversification effect | Maximum      
Main market risk metric      
VaR (39.9)    
Interest rate risk      
Main market risk metric      
VaR 7.9 17.9 12.7
ES 10.0    
Interest rate risk | Minimum      
Main market risk metric      
VaR 7.7    
Interest rate risk | Weighted average      
Main market risk metric      
VaR 16.2 15.5 14.9
Interest rate risk | Maximum      
Main market risk metric      
VaR 70.4    
Equity price risk      
Main market risk metric      
VaR 1.9 1.4 1.1
ES 2.1    
Equity price risk | Minimum      
Main market risk metric      
VaR 1.0    
Equity price risk | Weighted average      
Main market risk metric      
VaR 3.0 1.9 1.9
Equity price risk | Maximum      
Main market risk metric      
VaR 5.9    
Currency risk      
Main market risk metric      
VaR 3.3 4.8 2.6
ES 2.8    
Currency risk | Minimum      
Main market risk metric      
VaR 2.1    
Currency risk | Weighted average      
Main market risk metric      
VaR 6.6 6.9 4.5
Currency risk | Maximum      
Main market risk metric      
VaR 15.7    
Credit spread      
Main market risk metric      
VaR 4.6 3.3 2.9
ES 4.6    
Credit spread | Minimum      
Main market risk metric      
VaR 2.3    
Credit spread | Weighted average      
Main market risk metric      
VaR 3.6 4.2 5.2
Credit spread | Maximum      
Main market risk metric      
VaR 5.1    
Commodity price risk      
Main market risk metric      
VaR 0.0 0.1 0.1
ES 0.0    
Commodity price risk | Minimum      
Main market risk metric      
VaR 0.0    
Commodity price risk | Weighted average      
Main market risk metric      
VaR 0.0 € 0.1 € 0.2
Commodity price risk | Maximum      
Main market risk metric      
VaR € 0.1