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Note 8 - Fair Value - Significant Unobservable Inputs Used In Fair Value Measurement Of Assets (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
CVA Adjustment € (153)  
DVA Adjustment 138  
CVA and DVA Adjustment Impact (23) € 46
FVA Adjustment Impact € (10)  
Debt Securities [Member] | Net Present Value [Member] | Weighted Average [Member]    
Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Credit Spread 78.27  
Debt Securities [Member] | Net Present Value [Member] | Top Of Range [Member]    
Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Credit Spread 399.93  
Debt Securities [Member] | Net Present Value [Member] | Units [Member]    
Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Credit Spread b.p.  
Debt Securities [Member] | Market Comparable Prices [Member] | Bottom Of Range [Member]    
Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Recovery Rate 7.7%  
Other significant unobservable inputs 0%  
Debt Securities [Member] | Market Comparable Prices [Member] | Weighted Average [Member]    
Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Recovery Rate 32.7%  
Other significant unobservable inputs 82.15%  
Debt Securities [Member] | Market Comparable Prices [Member] | Top Of Range [Member]    
Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Recovery Rate 34.58%  
Other significant unobservable inputs 207.7%  
Debt Securities [Member] | Market Comparable Prices [Member] | Units [Member]    
Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Recovery Rate %  
Other significant unobservable inputs %  
Credit Option [Member] | Gaussian Copula [Member] | Bottom Of Range [Member]    
Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Correlation Default 35.19%  
Credit Option [Member] | Gaussian Copula [Member] | Weighted Average [Member]    
Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Correlation Default 43.92%  
Credit Option [Member] | Gaussian Copula [Member] | Top Of Range [Member]    
Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Correlation Default 57.82%  
Credit Option [Member] | Gaussian Copula [Member] | Units [Member]    
Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Correlation Default %  
Corporate Bond Option [Member] | Black 76 [Member] | Bottom Of Range [Member]    
Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Price Volatility -  
Corporate Bond Option [Member] | Black 76 [Member] | Weighted Average [Member]    
Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Price Volatility -  
Corporate Bond Option [Member] | Black 76 [Member] | Top Of Range [Member]    
Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Price Volatility -  
Corporate Bond Option [Member] | Black 76 [Member] | Units [Member]    
Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Price Volatility vegas  
Equity OTC Option [Member] | Heston [Member] | Bottom Of Range [Member]    
Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Forward Volatility 56.63  
Equity OTC Option [Member] | Heston [Member] | Weighted Average [Member]    
Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Forward Volatility 56.63  
Equity OTC Option [Member] | Heston [Member] | Top Of Range [Member]    
Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Forward Volatility 56.63  
Equity OTC Option [Member] | Heston [Member] | Units [Member]    
Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Forward Volatility Vegas  
Equity OTC Option [Member] | Local Volatility [Member] | Bottom Of Range [Member]    
Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Forward Volatility 1.89  
Equity OTC Option [Member] | Local Volatility [Member] | Weighted Average [Member]    
Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Forward Volatility 22.96  
Equity OTC Option [Member] | Local Volatility [Member] | Top Of Range [Member]    
Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Forward Volatility 77.03  
Equity OTC Option [Member] | Local Volatility [Member] | Units [Member]    
Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Forward Volatility Vegas  
Equity OTC Option [Member] | Black Scholes / Local Volatility [Member] | Bottom Of Range [Member]    
Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Forward Volatility 0.78  
Equity OTC Option [Member] | Black Scholes / Local Volatility [Member] | Weighted Average [Member]    
Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Forward Volatility 7.67  
Equity OTC Option [Member] | Black Scholes / Local Volatility [Member] | Top Of Range [Member]    
Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Forward Volatility 15.47  
Equity OTC Option [Member] | Black Scholes / Local Volatility [Member] | Units [Member]    
Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Forward Volatility Vegas  
Interest Rate Option [Member] | Libor Market Model Member [Member] | Bottom Of Range [Member]    
Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Forward Volatility -  
Beta 0.25  
Correlation Rate Credit -100  
Interest Rate Option [Member] | Libor Market Model Member [Member] | Weighted Average [Member]    
Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Forward Volatility -  
Beta 9  
Interest Rate Option [Member] | Libor Market Model Member [Member] | Top Of Range [Member]    
Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Forward Volatility -  
Beta 18  
Correlation Rate Credit 100  
Interest Rate Option [Member] | Libor Market Model Member [Member] | Units [Member]    
Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Forward Volatility Vegas  
Beta %  
Correlation Rate Credit %