v3.25.4
Note 22 Customer Deposits (Details) - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers € 502,501 € 447,646 € 413,487
SPAIN      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 228,672 215,464 197,780
MEXICO      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 94,699 85,439 92,828
TURKEY      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 52,687 49,267 43,239
South America [Member]      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 56,478 52,675 44,237
Europe [Member]      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 55,571 35,878 30,350
Rest of the world [Member]      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 14,394 8,922 5,052
Demand Deposits [Member]      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 360,682 331,780 317,543
Demand Deposits [Member] | SPAIN      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 192,222 186,489 179,825
Demand Deposits [Member] | MEXICO      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 77,167 70,133 76,122
Demand Deposits [Member] | TURKEY      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 27,443 23,228 20,423
Demand Deposits [Member] | South America [Member]      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 34,150 32,443 26,888
Demand Deposits [Member] | Europe [Member]      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 24,758 17,170 12,863
Demand Deposits [Member] | Rest of the world [Member]      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 4,942 2,318 1,422
Time deposits and other [Member]      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers [1] 127,397 106,658 91,740
Time deposits and other [Member] | SPAIN      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers [1] 23,664 22,501 17,952
Time deposits and other [Member] | MEXICO      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers [1] 17,493 14,319 15,067
Time deposits and other [Member] | TURKEY      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers [1] 24,794 25,388 21,485
Time deposits and other [Member] | South America [Member]      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers [1] 22,328 20,232 17,349
Time deposits and other [Member] | Europe [Member]      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers [1] 29,665 17,613 16,257
Time deposits and other [Member] | Rest of the world [Member]      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers [1] 9,452 6,605 3,630
Customer deposits repurchase agreements      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 14,422 9,208 4,204
Customer deposits repurchase agreements | SPAIN      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 12,786 6,474 4
Customer deposits repurchase agreements | MEXICO      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 38 987 1,638
Customer deposits repurchase agreements | TURKEY      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 450 652 1,331
Customer deposits repurchase agreements | South America [Member]      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 0 0 0
Customer deposits repurchase agreements | Europe [Member]      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers 1,148 1,095 1,231
Customer deposits repurchase agreements | Rest of the world [Member]      
Deposits From Customers By Geographical Area And Instrument [Line Items]      
Deposits from customers € 0 € 0 € 0
[1]
(1) The balances corresponding to subordinated deposits under this heading were not significant in any of the years presented.