v3.25.4
Debt securities - Debt securities by type and balance sheet lines (Details) - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Accumulated impairments      
Disclosure of financial assets [line items]      
Financial assets € (6,101) € (6,049)  
- Debt securities      
Disclosure of financial assets [line items]      
Financial assets 115,903 108,078  
- Debt securities | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 107,809 98,026  
- Debt securities | Accumulated impairments      
Disclosure of financial assets [line items]      
Financial assets (26) (27)  
- Debt securities | Government bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 58,163 47,780  
- Debt securities | Central bank bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 2,917 3,344  
- Debt securities | Sub-sovereign, Supranationals and Agencies | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 30,945 27,985  
- Debt securities | Covered bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 9,111 9,791  
- Debt securities | Corporate bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 248 1,033  
- Debt securities | Financial institutions' bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 1,300 3,261  
- Debt securities | ABS portfolio | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 5,125 4,832  
- Debt securities | Debt securities portfolio      
Disclosure of financial assets [line items]      
Financial assets 107,783 97,999  
Debt securities designated and mandatorily at fair value through profit or loss | - Debt securities      
Disclosure of financial assets [line items]      
Financial assets 11,219 15,586  
Debt securities designated and mandatorily at fair value through profit or loss | - Debt securities | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 3,099 5,506  
Debt securities designated and mandatorily at fair value through profit or loss | - Debt securities | Accumulated impairments      
Disclosure of financial assets [line items]      
Financial assets  
Debt securities designated and mandatorily at fair value through profit or loss | - Debt securities | Government bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 288 289  
Debt securities designated and mandatorily at fair value through profit or loss | - Debt securities | Central bank bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 376 444  
Debt securities designated and mandatorily at fair value through profit or loss | - Debt securities | Sub-sovereign, Supranationals and Agencies | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 413 1,027  
Debt securities designated and mandatorily at fair value through profit or loss | - Debt securities | Covered bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets  
Debt securities designated and mandatorily at fair value through profit or loss | - Debt securities | Corporate bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 89 848  
Debt securities designated and mandatorily at fair value through profit or loss | - Debt securities | Financial institutions' bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 1,176 2,141  
Debt securities designated and mandatorily at fair value through profit or loss | - Debt securities | ABS portfolio | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 757 757  
Debt securities designated and mandatorily at fair value through profit or loss | - Debt securities | Debt securities portfolio      
Disclosure of financial assets [line items]      
Financial assets 3,099 5,506  
Debt securities at fair value through other comprehensive income      
Disclosure of financial assets [line items]      
Financial assets 56,662 46,389 € 41,116
Debt securities at fair value through other comprehensive income | - Debt securities      
Disclosure of financial assets [line items]      
Financial assets 50,817 42,219  
Debt securities at fair value through other comprehensive income | - Debt securities | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 50,832 42,231  
Debt securities at fair value through other comprehensive income | - Debt securities | Accumulated impairments      
Disclosure of financial assets [line items]      
Financial assets (15) (12)  
Debt securities at fair value through other comprehensive income | - Debt securities | Government bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 32,578 24,757  
Debt securities at fair value through other comprehensive income | - Debt securities | Central bank bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets  
Debt securities at fair value through other comprehensive income | - Debt securities | Sub-sovereign, Supranationals and Agencies | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 13,788 11,513  
Debt securities at fair value through other comprehensive income | - Debt securities | Covered bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 3,750 4,108  
Debt securities at fair value through other comprehensive income | - Debt securities | Corporate bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 109 79  
Debt securities at fair value through other comprehensive income | - Debt securities | Financial institutions' bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 28 980  
Debt securities at fair value through other comprehensive income | - Debt securities | ABS portfolio | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 578 794  
Debt securities at fair value through other comprehensive income | - Debt securities | Debt securities portfolio      
Disclosure of financial assets [line items]      
Financial assets 50,817 42,219  
Debt securities at amortised cost | - Debt securities      
Disclosure of financial assets [line items]      
Financial assets 53,867 50,273  
Debt securities at amortised cost | - Debt securities | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 53,879 50,288  
Debt securities at amortised cost | - Debt securities | Accumulated impairments      
Disclosure of financial assets [line items]      
Financial assets (11) (15)  
Debt securities at amortised cost | - Debt securities | Government bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 25,297 22,734  
Debt securities at amortised cost | - Debt securities | Central bank bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 2,541 2,900  
Debt securities at amortised cost | - Debt securities | Sub-sovereign, Supranationals and Agencies | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 16,744 15,445  
Debt securities at amortised cost | - Debt securities | Covered bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 5,362 5,683  
Debt securities at amortised cost | - Debt securities | Corporate bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 50 106  
Debt securities at amortised cost | - Debt securities | Financial institutions' bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 96 139  
Debt securities at amortised cost | - Debt securities | ABS portfolio | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 3,790 3,281  
Debt securities at amortised cost | - Debt securities | Debt securities portfolio      
Disclosure of financial assets [line items]      
Financial assets € 53,867 € 50,273