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Note 21 Customer Deposits (Details) - EUR (€)
Jun. 30, 2021
Dec. 31, 2020
Deposits From Customers By Geographical Area And Instrument [Line Items]    
Deposits from customers € 338,795,000,000 € 342,661,000,000
Demand Deposits [Member] | SPAIN    
Deposits From Customers By Geographical Area And Instrument [Line Items]    
Deposits from customers 170,112,000,000 168,690,000,000
Demand Deposits [Member] | MEXICO    
Deposits From Customers By Geographical Area And Instrument [Line Items]    
Deposits from customers 47,789,000,000 43,768,000,000
Demand Deposits [Member] | TURKEY    
Deposits From Customers By Geographical Area And Instrument [Line Items]    
Deposits from customers 17,926,000,000 17,906,000,000
Demand Deposits [Member] | South America [Member]    
Deposits From Customers By Geographical Area And Instrument [Line Items]    
Deposits from customers 25,976,000,000 25,730,000,000
Demand Deposits [Member] | Europe [Member]    
Deposits From Customers By Geographical Area And Instrument [Line Items]    
Deposits from customers 8,310,000,000 8,435,000,000
Demand Deposits [Member] | Rest of the world [Member]    
Deposits From Customers By Geographical Area And Instrument [Line Items]    
Deposits from customers 1,608,000,000 1,720,000,000
Demand Deposits [Member] | Total customer deposits by country [Member]    
Deposits From Customers By Geographical Area And Instrument [Line Items]    
Deposits from customers 271,721,000,000 266,250,000,000
Deposits With Agreed Maturity [Member] | SPAIN    
Deposits From Customers By Geographical Area And Instrument [Line Items]    
Deposits from customers 15,100,000,000 20,065,000,000
Deposits With Agreed Maturity [Member] | MEXICO    
Deposits From Customers By Geographical Area And Instrument [Line Items]    
Deposits from customers 10,317,000,000 10,514,000,000
Deposits With Agreed Maturity [Member] | TURKEY    
Deposits From Customers By Geographical Area And Instrument [Line Items]    
Deposits from customers 17,114,000,000 16,707,000,000
Deposits With Agreed Maturity [Member] | South America [Member]    
Deposits From Customers By Geographical Area And Instrument [Line Items]    
Deposits from customers 10,478,000,000 11,259,000,000
Deposits With Agreed Maturity [Member] | Europe [Member]    
Deposits From Customers By Geographical Area And Instrument [Line Items]    
Deposits from customers 9,957,000,000 12,373,000,000
Deposits With Agreed Maturity [Member] | Rest of the world [Member]    
Deposits From Customers By Geographical Area And Instrument [Line Items]    
Deposits from customers 2,354,000,000 4,748,000,000
Deposits With Agreed Maturity [Member] | Total customer deposits by country [Member]    
Deposits From Customers By Geographical Area And Instrument [Line Items]    
Deposits from customers 65,320,000,000 75,666,000,000
Repurchase Agreements [Member] | SPAIN    
Deposits From Customers By Geographical Area And Instrument [Line Items]    
Deposits from customers 2,000,000 2,000,000
Repurchase Agreements [Member] | MEXICO    
Deposits From Customers By Geographical Area And Instrument [Line Items]    
Deposits from customers 1,134,000,000 117,000,000
Repurchase Agreements [Member] | TURKEY    
Deposits From Customers By Geographical Area And Instrument [Line Items]    
Deposits from customers 2,000,000 8,000,000
Repurchase Agreements [Member] | South America [Member]    
Deposits From Customers By Geographical Area And Instrument [Line Items]    
Deposits from customers 0 0
Repurchase Agreements [Member] | Europe [Member]    
Deposits From Customers By Geographical Area And Instrument [Line Items]    
Deposits from customers 616,000,000 619,000,000
Repurchase Agreements [Member] | Rest of the world [Member]    
Deposits From Customers By Geographical Area And Instrument [Line Items]    
Deposits from customers 0 0
Repurchase Agreements [Member] | Total customer deposits by country [Member]    
Deposits From Customers By Geographical Area And Instrument [Line Items]    
Deposits from customers 1,754,000,000 746,000,000
Total Deposits From Customers [Member] | SPAIN    
Deposits From Customers By Geographical Area And Instrument [Line Items]    
Deposits from customers 185,214,000,000 188,757,000,000
Total Deposits From Customers [Member] | MEXICO    
Deposits From Customers By Geographical Area And Instrument [Line Items]    
Deposits from customers 59,240,000,000 54,398,000,000
Total Deposits From Customers [Member] | TURKEY    
Deposits From Customers By Geographical Area And Instrument [Line Items]    
Deposits from customers 35,042,000,000 34,621,000,000
Total Deposits From Customers [Member] | South America [Member]    
Deposits From Customers By Geographical Area And Instrument [Line Items]    
Deposits from customers 36,454,000,000 36,989,000,000
Total Deposits From Customers [Member] | Europe [Member]    
Deposits From Customers By Geographical Area And Instrument [Line Items]    
Deposits from customers 18,883,000,000 21,427,000,000
Total Deposits From Customers [Member] | Rest of the world [Member]    
Deposits From Customers By Geographical Area And Instrument [Line Items]    
Deposits from customers 3,962,000,000 6,468,000,000
Total Deposits From Customers [Member] | Total customer deposits by country [Member]    
Deposits From Customers By Geographical Area And Instrument [Line Items]    
Deposits from customers € 338,795,000,000 € 342,661,000,000