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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, 2018
Dec. 31, 2017
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
CVA Adjustment € (163) € (153)
DVA Adjustment 214 138
CVA and DVA Adjustment impact (24) € (23)
FVA Adjustment Impact € (12)  
Debt Securities [Member] | Bottom Of Range Member | Net Present Value [Member]    
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Credit Spread 37  
Recovery Rate 0,00%  
Debt Securities [Member] | Bottom Of Range Member | Market Comparable Prices Member    
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Credit Spread 1,00%  
Debt Securities [Member] | Weighted Average Member | Net Present Value [Member]    
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Credit Spread 152,22  
Recovery Rate 32,06%  
Debt Securities [Member] | Weighted Average Member | Market Comparable Prices Member    
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Credit Spread 88,00%  
Debt Securities [Member] | Top Of Range [Member] | Net Present Value [Member]    
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Credit Spread 385,00  
Recovery Rate 40,00%  
Debt Securities [Member] | Top Of Range [Member] | Market Comparable Prices Member    
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Credit Spread 275,00%  
Debt Securities [Member] | Units | Net Present Value [Member]    
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Credit Spread b.p.  
Recovery Rate %  
Debt Securities [Member] | Units | Market Comparable Prices Member    
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Credit Spread %  
Credit Option [Member] | Bottom Of Range Member | Gaussian Copula [Member]    
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Correlation Default 0,00%  
Credit Option [Member] | Weighted Average Member | Gaussian Copula [Member]    
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Correlation Default 37,98%  
Credit Option [Member] | Top Of Range [Member] | Gaussian Copula [Member]    
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Correlation Default 60,26%  
Credit Option [Member] | Units | Gaussian Copula [Member]    
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Correlation Default %  
Corporate Bond Option [Member] | Bottom Of Range Member | Black 76 [Member]    
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Price Volatility -  
Corporate Bond Option [Member] | Weighted Average Member | Black 76 [Member]    
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Price Volatility -  
Corporate Bond Option [Member] | Top Of Range [Member] | Black 76 [Member]    
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Price Volatility -  
Corporate Bond Option [Member] | Units | Black 76 [Member]    
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Price Volatility vegas  
Equity OTC Option [Member] | Bottom Of Range Member | Heston [Member]    
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Forward Volatility 47,05  
Equity OTC Option [Member] | Bottom Of Range Member | Local volatility [Member]    
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Price Volatility 13,79  
Equity OTC Option [Member] | Bottom Of Range Member | Black Scholes Local Voatility [Member]    
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Forward Volatility 5,05  
Equity OTC Option [Member] | Weighted Average Member | Heston [Member]    
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Forward Volatility 47,05  
Equity OTC Option [Member] | Weighted Average Member | Local volatility [Member]    
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Price Volatility 27,24  
Equity OTC Option [Member] | Weighted Average Member | Black Scholes Local Voatility [Member]    
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Forward Volatility 7,73  
Equity OTC Option [Member] | Top Of Range [Member] | Heston [Member]    
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Forward Volatility 47,05  
Equity OTC Option [Member] | Top Of Range [Member] | Local volatility [Member]    
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Price Volatility 65,02  
Equity OTC Option [Member] | Top Of Range [Member] | Black Scholes Local Voatility [Member]    
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Forward Volatility 9,71  
Equity OTC Option [Member] | Units | Heston [Member]    
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Forward Volatility Vegas  
Equity OTC Option [Member] | Units | Local volatility [Member]    
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Price Volatility vegas  
Equity OTC Option [Member] | Units | Black Scholes Local Voatility [Member]    
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Forward Volatility vegas  
Interest Rate Option [Member] | Bottom Of Range Member | Libor Market Model [Member]    
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Beta (significant unobservable item) 0,25  
Correlation Rate Credit (100)  
Credit Default Volatility -  
Interest Rate Option [Member] | Weighted Average Member | Libor Market Model [Member]    
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Beta (significant unobservable item) 9,00  
Correlation Rate Credit -  
Credit Default Volatility -  
Interest Rate Option [Member] | Top Of Range [Member] | Libor Market Model [Member]    
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Beta (significant unobservable item) 18,00  
Correlation Rate Credit 100  
Credit Default Volatility -  
Interest Rate Option [Member] | Units | Libor Market Model [Member]    
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items    
Beta (significant unobservable item) %  
Correlation Rate Credit %  
Credit Default Volatility Vegas