v3.25.2
Debt securities - Debt securities by type and balance sheet lines (Details) - EUR (€)
€ in Millions
Jun. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
Provisions      
Disclosure of financial assets [line items]      
Financial assets € (5,945) € (6,049)  
Debt securities      
Disclosure of financial assets [line items]      
Financial assets 113,924 108,078  
Debt securities | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 103,435 98,026  
Debt securities | Provisions      
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 52,604 47,780  
Debt securities | Central bank bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 4,642 3,344  
Debt securities | Sub-sovereign, Supranationals and Agencies | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 29,282 27,985  
Debt securities | Covered bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 9,639 9,791  
Debt securities | Corporate bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 206 1,033  
Debt securities | Financial institutions' bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 1,963 3,261  
Debt securities | ABS portfolio | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 5,100 4,832  
Debt securities | Debt securities portfolio      
Disclosure of financial assets [line items]      
Financial assets 103,409 97,999  
Debt securities at fair value through profit or loss | Debt securities      
Disclosure of financial assets [line items]      
Financial assets 14,501 15,586  
Debt securities at fair value through profit or loss | Debt securities | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 3,986 5,506  
Debt securities at fair value through profit or loss | Debt securities | Provisions      
Disclosure of financial assets [line items]      
Financial assets  
Debt securities at fair value through profit or loss | Debt securities | Government bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 274 289  
Debt securities at fair value through profit or loss | Debt securities | Central bank bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 433 444  
Debt securities 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 730 1,027  
Debt securities at fair value through profit or loss | Debt securities | Covered bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets  
Debt securities at fair value through profit or loss | Debt securities | Corporate bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 17 848  
Debt securities at fair value through profit or loss | Debt securities | Financial institutions' bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 1,775 2,141  
Debt securities 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 at fair value through profit or loss | Debt securities | Debt securities portfolio      
Disclosure of financial assets [line items]      
Financial assets 3,986 5,506  
Debt securities at fair value through other comprehensive income      
Disclosure of financial assets [line items]      
Financial assets 49,846 46,389 € 41,116
Debt securities at fair value through other comprehensive income | Debt securities      
Disclosure of financial assets [line items]      
Financial assets 45,618 42,219  
Debt securities at fair value through other comprehensive income | Debt securities | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 45,633 42,231  
Debt securities at fair value through other comprehensive income | Debt securities | Provisions      
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 28,784 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 11,889 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 4,102 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 82 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 95 980  
Debt securities at fair value through other comprehensive income | Debt securities | ABS portfolio | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 681 794  
Debt securities at fair value through other comprehensive income | Debt securities | Debt securities portfolio      
Disclosure of financial assets [line items]      
Financial assets 45,618 42,219  
Debt securities at amortised cost | Debt securities      
Disclosure of financial assets [line items]      
Financial assets 53,805 50,273  
Debt securities at amortised cost | Debt securities | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 53,816 50,288  
Debt securities at amortised cost | Debt securities | Provisions      
Disclosure of financial assets [line items]      
Financial assets (12) (15)  
Debt securities at amortised cost | Debt securities | Government bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 23,546 22,734  
Debt securities at amortised cost | Debt securities | Central bank bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 4,209 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 16,663 15,445  
Debt securities at amortised cost | Debt securities | Covered bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 5,537 5,683  
Debt securities at amortised cost | Debt securities | Corporate bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 108 106  
Debt securities at amortised cost | Debt securities | Financial institutions' bonds | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 92 139  
Debt securities at amortised cost | Debt securities | ABS portfolio | Gross carrying amount      
Disclosure of financial assets [line items]      
Financial assets 3,662 3,281  
Debt securities at amortised cost | Debt securities | Debt securities portfolio      
Disclosure of financial assets [line items]      
Financial assets € 53,805 € 50,273