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Note 8 - Fair Value - Main Valuation Techniques Financial Instruments Liabilities - Significant Observable Inputs Used In Fair Value Measurement Of Liabilities (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Main Valuation Techniques Financial Instruments Liabilities Line Items      
Liabilities € 623,814 € 636,736 € 676,428
Financial Liabilities Held For Trading [Member] | Level 2 Of Fair Value Hierarchy Member      
Main Valuation Techniques Financial Instruments Liabilities Line Items      
Liabilities 57,573    
Financial Liabilities Held For Trading [Member] | Level 3 Of Fair Value Hierarchy Member      
Main Valuation Techniques Financial Instruments Liabilities Line Items      
Liabilities 269    
Financial Liabilities Held For Trading [Member] | Deposits [Member] | Level 2 Of Fair Value Hierarchy Member      
Main Valuation Techniques Financial Instruments Liabilities Line Items      
Liabilities 29,945    
Financial Liabilities Held For Trading [Member] | Deposits [Member] | Level 3 Of Fair Value Hierarchy Member      
Main Valuation Techniques Financial Instruments Liabilities Line Items      
Liabilities 0    
Financial Liabilities Held For Trading [Member] | Derivatives [Member] | Level 2 Of Fair Value Hierarchy Member      
Main Valuation Techniques Financial Instruments Liabilities Line Items      
Liabilities 27,628    
Financial Liabilities Held For Trading [Member] | Derivatives [Member] | Level 3 Of Fair Value Hierarchy Member      
Main Valuation Techniques Financial Instruments Liabilities Line Items      
Liabilities € 267    
Financial Liabilities Held For Trading [Member] | Interest Rate Hedge [Member] | Total [Member]      
Main Valuation Techniques Financial Instruments Liabilities Line Items      
Valuation Tecnniques Interest rate products (Interest rate swaps, Call money Swaps y FRA): Discounted cash flows Caps/Floors: Black, Hull-White y SABR Bond options: Black Swaptions: Black, Hull-White y LGM Other Interest rate options: Black, Hull-White y LGM Constant Maturity Swaps: SABR    
Main Observable Inputs - Exchange rates - Market quoted future prices - Market interest rates - Underlying assets prices: shares, funds, commodities - Market observable volatilities - Issuer credit spread levels - Quoted dividends - Market listed correlations    
Main Unobservable Inputs - Beta - Correlation between tenors - interest rates volatility    
Financial Liabilities Held For Trading [Member] | Equity Hedge [Member] | Total [Member]      
Main Valuation Techniques Financial Instruments Liabilities Line Items      
Valuation Tecnniques Future and Equity Forward: Discounted future cash flows Equity Options: Local Volatility, Momentum adjustment    
Main Observable Inputs - Exchange rates - Market quoted future prices - Market interest rates - Underlying assets prices: shares, funds, commodities - Market observable volatilities - Issuer credit spread levels - Quoted dividends - Market listed correlations    
Main Unobservable Inputs - Volatility of volatility - Assets correlation    
Financial Liabilities Held For Trading [Member] | Foreign Exchange And Gold Hedge [Member] | Total [Member]      
Main Valuation Techniques Financial Instruments Liabilities Line Items      
Valuation Tecnniques Future and Equity Forward: Discounted future cash flows Foreign exchange Options: Local Volatility, moments adjustment    
Main Observable Inputs - Exchange rates - Market quoted future prices - Market interest rates - Underlying assets prices: shares, funds, commodities - Market observable volatilities - Issuer credit spread levels - Quoted dividends - Market listed correlations    
Main Unobservable Inputs - Volatility of volatility - Assets correlation    
Financial Liabilities Held For Trading [Member] | Credit Hedge [Member] | Total [Member]      
Main Valuation Techniques Financial Instruments Liabilities Line Items      
Valuation Tecnniques Credit Derivatives: Default model and Gaussian copula    
Main Observable Inputs - Exchange rates - Market quoted future prices - Market interest rates - Underlying assets prices: shares, funds, commodities - Market observable volatilities - Issuer credit spread levels - Quoted dividends - Market listed correlations    
Main Unobservable Inputs - Correlation default - Credit spread - Recovery rates - Interest rate yield - Default volatility    
Financial Liabilities Held For Trading [Member] | Commodities Hedge [Member] | Total [Member]      
Main Valuation Techniques Financial Instruments Liabilities Line Items      
Valuation Tecnniques Commodities: Momentum adjustment and Discounted cash flows    
Main Observable Inputs - Exchange rates - Market quoted future prices - Market interest rates - Underlying assets prices: shares, funds, commodities - Market observable volatilities - Issuer credit spread levels - Quoted dividends - Market listed correlations    
Financial Liabilities Held For Trading [Member] | Short Positions [Member] | Level 2 Of Fair Value Hierarchy Member      
Main Valuation Techniques Financial Instruments Liabilities Line Items      
Liabilities € 0    
Financial Liabilities Held For Trading [Member] | Short Positions [Member] | Level 3 Of Fair Value Hierarchy Member      
Main Valuation Techniques Financial Instruments Liabilities Line Items      
Liabilities € 1    
Financial Liabilities Held For Trading [Member] | Short Positions [Member] | Total [Member]      
Main Valuation Techniques Financial Instruments Liabilities Line Items      
Valuation Tecnniques Present-value method (Discounted future cash flows)    
Main Unobservable Inputs - Correlation default - Credit spread - Recovery rates - Interest rate yield    
Financial assets designated at fair value through profit or loss [Member] | Level 2 Of Fair Value Hierarchy Member      
Main Valuation Techniques Financial Instruments Liabilities Line Items      
Liabilities € 4,478    
Financial assets designated at fair value through profit or loss [Member] | Level 3 Of Fair Value Hierarchy Member      
Main Valuation Techniques Financial Instruments Liabilities Line Items      
Liabilities € 2,515    
Financial assets designated at fair value through profit or loss [Member] | Total [Member]      
Main Valuation Techniques Financial Instruments Liabilities Line Items      
Valuation Tecnniques Present-value method (Discounted future cash flows)    
Main Observable Inputs - Prepayment rates - Issuer´s credit risk - Current market interest rates    
Main Unobservable Inputs - Prepayment rates - Issuer´s credit risk - Current market interest rates    
Derivatives Hedge accounting [Member] | Level 2 Of Fair Value Hierarchy Member      
Main Valuation Techniques Financial Instruments Liabilities Line Items      
Liabilities € 2,454    
Derivatives Hedge accounting [Member] | Level 3 Of Fair Value Hierarchy Member      
Main Valuation Techniques Financial Instruments Liabilities Line Items      
Liabilities € 3    
Derivatives Hedge accounting [Member] | Interest Rate Hedge [Member] | Total [Member]      
Main Valuation Techniques Financial Instruments Liabilities Line Items      
Valuation Tecnniques Interest rate products (Interest rate swaps, Call money Swaps y FRA): Discounted cash flows Caps/Floors: Black, Hull-White y SABR Bond options: Black Swaptions: Black, Hull-White y LGM Other Interest rate options: Black, Hull-White y LGM Constant Maturity Swaps: SABR    
Main Observable Inputs - Exchange rates - Market quoted future prices - Market interest rates - Underlying assets prices: shares, funds, commodities - Market observable volatilities - Issuer credit spread levels - Quoted dividends - Market listed correlations    
Main Unobservable Inputs - Beta - Implicit correlations between tenors - interest rates volatility    
Derivatives Hedge accounting [Member] | Equity Hedge [Member] | Total [Member]      
Main Valuation Techniques Financial Instruments Liabilities Line Items      
Valuation Tecnniques Future and Equity Forward: Discounted future cash flows Equity Options: Local Volatility, Momentum adjustment    
Main Observable Inputs - Exchange rates - Market quoted future prices - Market interest rates - Underlying assets prices: shares, funds, commodities - Market observable volatilities - Issuer credit spread levels - Quoted dividends - Market listed correlations    
Main Unobservable Inputs - Volatility of volatility - Implicit assets correlations - Long term implicit correlations - Implicit dividends and long term repos    
Derivatives Hedge accounting [Member] | Foreign Exchange And Gold Hedge [Member] | Total [Member]      
Main Valuation Techniques Financial Instruments Liabilities Line Items      
Valuation Tecnniques Future and Equity Forward: Discounted future cash flows Foreign exchange Options: Local Volatility, moments adjustment    
Main Observable Inputs - Exchange rates - Market quoted future prices - Market interest rates - Underlying assets prices: shares, funds, commodities - Market observable volatilities - Issuer credit spread levels - Quoted dividends - Market listed correlations    
Main Unobservable Inputs - Volatility of volatility - Implicit assets correlations - Long term implicit correlations    
Derivatives Hedge accounting [Member] | Credit Hedge [Member] | Total [Member]      
Main Valuation Techniques Financial Instruments Liabilities Line Items      
Valuation Tecnniques Credit Derivatives: Default model and Gaussian copula    
Main Observable Inputs - Exchange rates - Market quoted future prices - Market interest rates - Underlying assets prices: shares, funds, commodities - Market observable volatilities - Issuer credit spread levels - Quoted dividends - Market listed correlations    
Main Unobservable Inputs - Correlation default - Credit spread - Recovery rates - Interest rate yield - Default volatility    
Derivatives Hedge accounting [Member] | Commodities Hedge [Member] | Total [Member]      
Main Valuation Techniques Financial Instruments Liabilities Line Items      
Valuation Tecnniques Commodities: Momentum adjustment and Discounted cash flows    
Main Observable Inputs - Exchange rates - Market quoted future prices - Market interest rates - Underlying assets prices: shares, funds, commodities - Market observable volatilities - Issuer credit spread levels - Quoted dividends - Market listed correlations