v3.26.1
Debt securities - Disclosure of detailed information about debt instruments explanatory (Details) - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Debt Instruments        
Financial assets held for trading € 252,318 € 230,253 € 176,921  
Non-trading financial assets mandatorily at fair value through profit or loss 7,761 6,130 5,910  
Financial assets at fair value through other comprehensive income 74,612 89,898 83,308  
Financial assets at amortised cost 1,202,689 1,203,707 1,191,403  
Total financial assets 300,026 283,497 243,203  
Debt securities        
Debt Instruments        
Financial assets held for trading 98,568 82,646 62,124  
Non-trading financial assets mandatorily at fair value through profit or loss 245 447 860  
Financial assets designated at fair value through profit or loss 2,894 2,897 3,095  
Financial assets at fair value through other comprehensive income 58,305 76,558 73,565  
Financial assets at amortised cost 140,014 120,949 103,559  
Total financial assets 300,026 283,497 243,203  
Gross carrying amount | Debt securities        
Debt Instruments        
Total financial assets 300,546 283,846 243,489  
Gross carrying amount | Debt securities | Financial instruments credit-impaired        
Debt Instruments        
Total financial assets 842 701 461  
Gross carrying amount | Debt securities | Euro        
Debt Instruments        
Total financial assets 142,969 118,456 90,857  
Gross carrying amount | Debt securities | Pound sterling        
Debt Instruments        
Total financial assets 14,114 15,630 9,284  
Gross carrying amount | Debt securities | US dollar        
Debt Instruments        
Total financial assets 50,671 48,189 38,161  
Gross carrying amount | Debt securities | Brazilian real        
Debt Instruments        
Total financial assets 48,231 44,432 46,190  
Gross carrying amount | Debt securities | Other currencies        
Debt Instruments        
Total financial assets 44,561 57,139 58,997  
Gross carrying amount | Spanish government debt securities        
Debt Instruments        
Total financial assets 63,742 56,919 40,321  
Gross carrying amount | Foreign government debt securities        
Debt Instruments        
Total financial assets 172,468 164,747 145,732  
Gross carrying amount | Issued by financial institutions        
Debt Instruments        
Total financial assets 17,465 16,776 14,681  
Gross carrying amount | Other fixed-income securities        
Debt Instruments        
Total financial assets 46,029 44,703 42,294  
Accumulated impairment        
Debt Instruments        
Total financial assets (520) (349) (286)  
Accumulated impairment | Debt securities        
Debt Instruments        
Total financial assets € (520) € (349) € (286) € (226)