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Nota 8 - Fair Value Instruments Carried At Cost - Main Valuation Techniques - Liabilities (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Liabilities Line Items      
Liabilities € 623,814 € 636,736 € 676,428
Not Measured At Fair Value In Statement Of Financial Position But For Which Fair Value Is Disclosed Member | Financial liabilities at amortized cost [Member] | Central Banks [Member]      
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Liabilities Line Items      
Valuation Technique used in fair value measurement assets Present-value method (Discounted future cash flows)    
Description Of Inputs Used In Fair Value Measurement Liabilities - Issuer´s credit risk - Prepayment rates - Interest rate yield    
Not Measured At Fair Value In Statement Of Financial Position But For Which Fair Value Is Disclosed Member | Financial liabilities at amortized cost [Member] | Credit Institutions [Member]      
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Liabilities Line Items      
Valuation Technique used in fair value measurement assets Present-value method (Discounted future cash flows)    
Description Of Inputs Used In Fair Value Measurement Liabilities - Issuer´s credit risk - Prepayment rates - Interest rate yield    
Not Measured At Fair Value In Statement Of Financial Position But For Which Fair Value Is Disclosed Member | Financial liabilities at amortized cost [Member] | Customers [Member]      
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Liabilities Line Items      
Valuation Technique used in fair value measurement assets Present-value method (Discounted future cash flows)    
Description Of Inputs Used In Fair Value Measurement Liabilities - Issuer´s credit risk - Prepayment rates - Interest rate yield    
Not Measured At Fair Value In Statement Of Financial Position But For Which Fair Value Is Disclosed Member | Financial liabilities at amortized cost [Member] | Debt Securities Issued [Member]      
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Liabilities Line Items      
Valuation Technique used in fair value measurement assets Present-value method (Discounted future cash flows)    
Description Of Inputs Used In Fair Value Measurement Liabilities - Issuer´s credit risk - Prepayment rates - Interest rate yield    
Not Measured At Fair Value In Statement Of Financial Position But For Which Fair Value Is Disclosed Member | Financial liabilities at amortized cost [Member] | Other Financial Liabilities Domain [Member]      
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Liabilities Line Items      
Valuation Technique used in fair value measurement assets Present-value method (Discounted future cash flows)    
Description Of Inputs Used In Fair Value Measurement Liabilities - Issuer´s credit risk - Prepayment rates - Interest rate yield    
Not Measured At Fair Value In Statement Of Financial Position But For Which Fair Value Is Disclosed Member | Level 2 Of Fair Value Hierarchy Member | Financial liabilities at amortized cost [Member]      
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Liabilities Line Items      
Liabilities € 269,128    
Not Measured At Fair Value In Statement Of Financial Position But For Which Fair Value Is Disclosed Member | Level 2 Of Fair Value Hierarchy Member | Financial liabilities at amortized cost [Member] | Central Banks [Member]      
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Liabilities Line Items      
Liabilities 196    
Not Measured At Fair Value In Statement Of Financial Position But For Which Fair Value Is Disclosed Member | Level 2 Of Fair Value Hierarchy Member | Financial liabilities at amortized cost [Member] | Credit Institutions [Member]      
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Liabilities Line Items      
Liabilities 22,281    
Not Measured At Fair Value In Statement Of Financial Position But For Which Fair Value Is Disclosed Member | Level 2 Of Fair Value Hierarchy Member | Financial liabilities at amortized cost [Member] | Customers [Member]      
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Liabilities Line Items      
Liabilities 240,547    
Not Measured At Fair Value In Statement Of Financial Position But For Which Fair Value Is Disclosed Member | Level 2 Of Fair Value Hierarchy Member | Financial liabilities at amortized cost [Member] | Debt Securities Issued [Member]      
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Liabilities Line Items      
Liabilities 6,104    
Not Measured At Fair Value In Statement Of Financial Position But For Which Fair Value Is Disclosed Member | Level 2 Of Fair Value Hierarchy Member | Financial liabilities at amortized cost [Member] | Other Financial Liabilities Domain [Member]      
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Liabilities Line Items      
Liabilities 0    
Not Measured At Fair Value In Statement Of Financial Position But For Which Fair Value Is Disclosed Member | Level 3 Of Fair Value Hierarchy Member | Financial liabilities at amortized cost [Member]      
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Liabilities Line Items      
Liabilities 182,948    
Not Measured At Fair Value In Statement Of Financial Position But For Which Fair Value Is Disclosed Member | Level 3 Of Fair Value Hierarchy Member | Financial liabilities at amortized cost [Member] | Central Banks [Member]      
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Liabilities Line Items      
Liabilities 0    
Not Measured At Fair Value In Statement Of Financial Position But For Which Fair Value Is Disclosed Member | Level 3 Of Fair Value Hierarchy Member | Financial liabilities at amortized cost [Member] | Credit Institutions [Member]      
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Liabilities Line Items      
Liabilities 9,852    
Not Measured At Fair Value In Statement Of Financial Position But For Which Fair Value Is Disclosed Member | Level 3 Of Fair Value Hierarchy Member | Financial liabilities at amortized cost [Member] | Customers [Member]      
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Liabilities Line Items      
Liabilities 135,270    
Not Measured At Fair Value In Statement Of Financial Position But For Which Fair Value Is Disclosed Member | Level 3 Of Fair Value Hierarchy Member | Financial liabilities at amortized cost [Member] | Debt Securities Issued [Member]      
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Liabilities Line Items      
Liabilities 25,096    
Not Measured At Fair Value In Statement Of Financial Position But For Which Fair Value Is Disclosed Member | Level 3 Of Fair Value Hierarchy Member | Financial liabilities at amortized cost [Member] | Other Financial Liabilities Domain [Member]      
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Liabilities Line Items      
Liabilities € 12,730