v3.25.4
Note 14 Debt securities at amortized cost (Details) - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Debt securities at amortized cost [Line Items]      
Debt instruments held at amortised cost € 73,379 € 59,014 € 49,462
Domestic debt securities [Member]      
Debt securities at amortized cost [Line Items]      
Debt instruments held at amortised cost 40,764 37,130 27,114
Domestic debt securities [Member] | Government [member]      
Debt securities at amortized cost [Line Items]      
Debt instruments held at amortised cost 39,252 35,664 25,857
Domestic debt securities [Member] | credit institutions [Member]      
Debt securities at amortized cost [Line Items]      
Debt instruments held at amortised cost 1,108 1,099 1,028
Domestic debt securities [Member] | Other issuers [Member]      
Debt securities at amortized cost [Line Items]      
Debt instruments held at amortised cost 404 367 230
MEXICO      
Debt securities at amortized cost [Line Items]      
Debt instruments held at amortised cost 6,701 4,139 6,277
MEXICO | Government [member]      
Debt securities at amortized cost [Line Items]      
Debt instruments held at amortised cost 5,142 4,076 6,205
MEXICO | Central banks [Member]      
Debt securities at amortized cost [Line Items]      
Debt instruments held at amortised cost 1,519 0 0
MEXICO | credit institutions [Member]      
Debt securities at amortized cost [Line Items]      
Debt instruments held at amortised cost 40 63 72
MEXICO | Other issuers [Member]      
Debt securities at amortized cost [Line Items]      
Debt instruments held at amortised cost 0 0 0
UNITED STATES      
Debt securities at amortized cost [Line Items]      
Debt instruments held at amortised cost 2,282 2,505 2,229
UNITED STATES | Government [member]      
Debt securities at amortized cost [Line Items]      
Debt instruments held at amortised cost 2,244 2,463 2,188
UNITED STATES | credit institutions [Member]      
Debt securities at amortized cost [Line Items]      
Debt instruments held at amortised cost 21 20 19
UNITED STATES | Other issuers [Member]      
Debt securities at amortized cost [Line Items]      
Debt instruments held at amortised cost 17 22 21
TURKEY      
Debt securities at amortized cost [Line Items]      
Debt instruments held at amortised cost 5,288 6,764 6,284
TURKEY | Government [member]      
Debt securities at amortized cost [Line Items]      
Debt instruments held at amortised cost 5,251 6,622 6,167
TURKEY | credit institutions [Member]      
Debt securities at amortized cost [Line Items]      
Debt instruments held at amortised cost 8 7 8
TURKEY | Other issuers [Member]      
Debt securities at amortized cost [Line Items]      
Debt instruments held at amortised cost 29 135 109
Other Countries [Member]      
Debt securities at amortized cost [Line Items]      
Debt instruments held at amortised cost 18,345 8,476 7,558
Other Countries [Member] | Government [member]      
Debt securities at amortized cost [Line Items]      
Debt instruments held at amortised cost 13,980 5,982 4,707
Other Countries [Member] | Central banks [Member]      
Debt securities at amortized cost [Line Items]      
Debt instruments held at amortised cost 79 6 22
Other Countries [Member] | credit institutions [Member]      
Debt securities at amortized cost [Line Items]      
Debt instruments held at amortised cost 2,738 1,269 1,239
Other Countries [Member] | Other issuers [Member]      
Debt securities at amortized cost [Line Items]      
Debt instruments held at amortised cost 1,548 1,219 1,591
Foreign debt securities [Member]      
Debt securities at amortized cost [Line Items]      
Debt instruments held at amortised cost € 32,615 € 21,884 € 22,348