v3.25.4
Note 13 Financial assets at fair value through other comprehensive income debt securities (Details) - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Debt securities at fair value through other comprehensive income € 57,001 € 57,526 € 60,963
Issued in euros [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Debt securities at fair value through other comprehensive income 10,997 11,475 15,111
Issued in euros [Member] | Government [member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Debt securities at fair value through other comprehensive income 10,090 10,383 13,757
Issued in euros [Member] | credit institutions [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Debt securities at fair value through other comprehensive income 518 695 901
Issued in euros [Member] | Other issuers [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Debt securities at fair value through other comprehensive income 389 397 454
MEXICO      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Debt securities at fair value through other comprehensive income 20,995 20,461 21,714
MEXICO | Government [member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Debt securities at fair value through other comprehensive income 19,752 19,313 20,364
MEXICO | credit institutions [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Debt securities at fair value through other comprehensive income 876 759 886
MEXICO | Other issuers [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Debt securities at fair value through other comprehensive income 367 389 464
UNITED STATES      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Debt securities at fair value through other comprehensive income 6,214 6,552 6,344
UNITED STATES | Government [member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Debt securities at fair value through other comprehensive income 3,621 3,703 3,174
UNITED STATES | credit institutions [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Debt securities at fair value through other comprehensive income 48 41 88
UNITED STATES | Other issuers [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Debt securities at fair value through other comprehensive income 2,546 2,808 3,082
TURKEY      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Debt securities at fair value through other comprehensive income 2,907 2,849 2,459
TURKEY | Government [member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Debt securities at fair value through other comprehensive income 2,907 2,837 2,445
TURKEY | Other issuers [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Debt securities at fair value through other comprehensive income 0 12 14
Other Countries [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Debt securities at fair value through other comprehensive income 15,888 16,190 15,336
Other Countries [Member] | Government [member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Debt securities at fair value through other comprehensive income 10,277 10,059 8,961
Other Countries [Member] | Central banks [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Debt securities at fair value through other comprehensive income 208 370 508
Other Countries [Member] | credit institutions [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Debt securities at fair value through other comprehensive income 2,204 1,921 1,895
Other Countries [Member] | Other issuers [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Debt securities at fair value through other comprehensive income 3,199 3,840 3,971
Total foreign [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Debt securities at fair value through other comprehensive income € 46,004 € 46,052 € 45,852