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Debt securities - Debt securities by type and balance sheet lines (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accumulated impairments      
Disclosure Of Financial Assets [Line Items]      
Financial assets € (5,839) € (6,101)  
Debt securities      
Disclosure Of Financial Assets [Line Items]      
Financial assets 98,864 87,703  
Debt securities | Gross carrying amount      
Disclosure Of Financial Assets [Line Items]      
Financial assets 91,991 83,551  
Debt securities | Accumulated impairments      
Disclosure Of Financial Assets [Line Items]      
Financial assets (34) (39)  
Debt securities | Government bonds | Gross carrying amount      
Disclosure Of Financial Assets [Line Items]      
Financial assets 45,400 40,708  
Debt securities | Central bank bonds | Gross carrying amount      
Disclosure Of Financial Assets [Line Items]      
Financial assets 2,489 2,638  
Debt securities | Sub-sovereign, Supranationals and Agencies | Gross carrying amount      
Disclosure Of Financial Assets [Line Items]      
Financial assets 27,580 25,082  
Debt securities | Covered bonds | Gross carrying amount      
Disclosure Of Financial Assets [Line Items]      
Financial assets 9,315 8,206  
Debt securities | Corporate bonds | Gross carrying amount      
Disclosure Of Financial Assets [Line Items]      
Financial assets 1,035 991  
Debt securities | Financial institutions' bonds | Gross carrying amount      
Disclosure Of Financial Assets [Line Items]      
Financial assets 2,314 2,923  
Debt securities | ABS portfolio | Gross carrying amount      
Disclosure Of Financial Assets [Line Items]      
Financial assets 3,860 3,003  
Debt securities | Debt securities portfolio      
Disclosure Of Financial Assets [Line Items]      
Financial assets 91,957 83,513  
Debt securities at fair value through profit or loss | Debt securities      
Disclosure Of Financial Assets [Line Items]      
Financial assets 5,363 6,258  
Debt securities at fair value through profit or loss | Debt securities | Gross carrying amount      
Disclosure Of Financial Assets [Line Items]      
Financial assets 5,363 6,258  
Debt securities at fair value through profit or loss | Debt securities | Accumulated impairments      
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 362 63  
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 446 307  
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 1,354 2,343  
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 799 857  
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 1,645 1,931  
Debt securities at fair value through profit or loss | Debt securities | ABS portfolio | Gross carrying amount      
Disclosure Of Financial Assets [Line Items]      
Financial assets 758 758  
Debt securities at fair value through profit or loss | Debt securities | Debt securities portfolio      
Disclosure Of Financial Assets [Line Items]      
Financial assets 5,363 6,258  
Debt securities at fair value through other comprehensive income      
Disclosure Of Financial Assets [Line Items]      
Financial assets 41,116 31,625 € 30,635
Debt securities at fair value through other comprehensive income | Debt securities      
Disclosure Of Financial Assets [Line Items]      
Financial assets 38,281 29,095  
Debt securities at fair value through other comprehensive income | Debt securities | Gross carrying amount      
Disclosure Of Financial Assets [Line Items]      
Financial assets 38,293 29,116  
Debt securities at fair value through other comprehensive income | Debt securities | Accumulated impairments      
Disclosure Of Financial Assets [Line Items]      
Financial assets (13) (21)  
Debt securities at fair value through other comprehensive income | Debt securities | Government bonds | Gross carrying amount      
Disclosure Of Financial Assets [Line Items]      
Financial assets 20,988 16,016  
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 11,587 8,529  
Debt securities at fair value through other comprehensive income | Debt securities | Covered bonds | Gross carrying amount      
Disclosure Of Financial Assets [Line Items]      
Financial assets 4,084 2,663  
Debt securities at fair value through other comprehensive income | Debt securities | Corporate bonds | Gross carrying amount      
Disclosure Of Financial Assets [Line Items]      
Financial assets 127 108  
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 483 772  
Debt securities at fair value through other comprehensive income | Debt securities | ABS portfolio | Gross carrying amount      
Disclosure Of Financial Assets [Line Items]      
Financial assets 1,025 1,028  
Debt securities at fair value through other comprehensive income | Debt securities | Debt securities portfolio      
Disclosure Of Financial Assets [Line Items]      
Financial assets 38,281 29,095  
Debt securities at amortised cost | Debt securities      
Disclosure Of Financial Assets [Line Items]      
Financial assets 48,313 48,160  
Debt securities at amortised cost | Debt securities | Gross carrying amount      
Disclosure Of Financial Assets [Line Items]      
Financial assets 48,335 48,177  
Debt securities at amortised cost | Debt securities | Accumulated impairments      
Disclosure Of Financial Assets [Line Items]      
Financial assets (22) (17)  
Debt securities at amortised cost | Debt securities | Government bonds | Gross carrying amount      
Disclosure Of Financial Assets [Line Items]      
Financial assets 24,050 24,629  
Debt securities at amortised cost | Debt securities | Central bank bonds | Gross carrying amount      
Disclosure Of Financial Assets [Line Items]      
Financial assets 2,043 2,331  
Debt securities at amortised cost | Debt securities | Sub-sovereign, Supranationals and Agencies | Gross carrying amount      
Disclosure Of Financial Assets [Line Items]      
Financial assets 14,639 14,210  
Debt securities at amortised cost | Debt securities | Covered bonds | Gross carrying amount      
Disclosure Of Financial Assets [Line Items]      
Financial assets 5,231 5,543  
Debt securities at amortised cost | Debt securities | Corporate bonds | Gross carrying amount      
Disclosure Of Financial Assets [Line Items]      
Financial assets 109 26  
Debt securities at amortised cost | Debt securities | Financial institutions' bonds | Gross carrying amount      
Disclosure Of Financial Assets [Line Items]      
Financial assets 186 220  
Debt securities at amortised cost | Debt securities | ABS portfolio | Gross carrying amount      
Disclosure Of Financial Assets [Line Items]      
Financial assets 2,077 1,217  
Debt securities at amortised cost | Debt securities | Debt securities portfolio      
Disclosure Of Financial Assets [Line Items]      
Financial assets € 48,313 € 48,160