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Note 22 Customer Deposits (Details) - EUR (€)
€ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers € 393,856 € 349,761 € 342,661
SPAIN      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 202,194 191,974 188,757
MEXICO      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 78,217 64,247 54,398
TURKEY      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 40,118 33,376 34,621
South America [Member]      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 41,587 37,861 36,989
Europe [Member]      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 26,774 19,234 21,427
Rest of the world [Member]      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 4,965 3,070 6,468
Demand Deposits [Member]      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 316,082 293,015 266,250
Demand Deposits [Member] | SPAIN      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 188,803 181,565 168,690
Demand Deposits [Member] | MEXICO      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 64,671 53,359 43,768
Demand Deposits [Member] | TURKEY      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 22,117 19,725 17,906
Demand Deposits [Member] | South America [Member]      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 27,083 28,039 25,730
Demand Deposits [Member] | Europe [Member]      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 11,670 8,933 8,435
Demand Deposits [Member] | Rest of the world [Member]      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 1,737 1,393 1,720
Time deposits and other [Member]      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 75,516 55,479 75,666
Time deposits and other [Member] | SPAIN      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 13,389 10,407 20,065
Time deposits and other [Member] | MEXICO      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 12,916 10,383 10,514
Time deposits and other [Member] | TURKEY      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 17,254 13,644 16,707
Time deposits and other [Member] | South America [Member]      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 14,505 9,822 11,259
Time deposits and other [Member] | Europe [Member]      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 14,224 9,546 12,373
Time deposits and other [Member] | Rest of the world [Member]      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 3,228 1,677 4,748
Repurchase Agreements [Member]      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 2,259 1,267 746
Repurchase Agreements [Member] | SPAIN      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 2 2 2
Repurchase Agreements [Member] | MEXICO      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 630 505 117
Repurchase Agreements [Member] | TURKEY      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 747 6 8
Repurchase Agreements [Member] | South America [Member]      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 0 0 0
Repurchase Agreements [Member] | Europe [Member]      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 880 754 619
Repurchase Agreements [Member] | Rest of the world [Member]      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers € 0 € 0 € 0