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Derivatives and hedge accounting - Hedged items included in a fair value hedging relationship (Details) - -  fair value hedges - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about hedged items [line items]      
Change in fair value hedging instruments for the period € 1,016 € 1,606 € (5,928)
Interest Rate And Forex Risk | - Derivatives      
Disclosure of detailed information about hedged items [line items]      
Hedged item, assets 50,070 40,394  
Hedged item, liabilities 100,827 84,967  
Accumulated fair value hedge adjustment remaining in statement of financial position for hedged item that ceased to be adjusted for hedging gains and losses, assets 58 91  
Carrying amount net investment hedge reserve at the end of the reporting period (126) (113)  
Accumulated fair value hedge adjustment remaining in statement of financial position for hedged item that ceased to be adjusted for hedging gains and losses, liabilities (5) (4)  
Accumulated fair value hedge adjustment on hedged item included in carrying amount, liabilities (2,906) (4,221)  
Change in fair value of the hedged item for measuring ineffectiveness for the period (1,043) (1,679)  
Change in fair value hedging instruments for the period 1,016 1,606  
Hedge ineffectiveness recognised in the statement of profit or loss gain (+) / loss (-) (27) (73)  
- Debt securities | Interest Rate And Forex Risk | - Derivatives      
Disclosure of detailed information about hedged items [line items]      
Hedged item, liabilities 83,669 70,280  
Accumulated fair value hedge adjustment remaining in statement of financial position for hedged item that ceased to be adjusted for hedging gains and losses, liabilities (2,234) (3,383)  
Change in fair value of the hedged item for measuring ineffectiveness for the period (1,139) (2,680)  
- Debt securities | Financial assets at FVOCI | Interest Rate And Forex Risk | - Derivatives      
Disclosure of detailed information about hedged items [line items]      
Hedged item, assets 35,119 31,224  
Change in fair value of the hedged item for measuring ineffectiveness for the period 269 1,224  
- Debt securities | Financial assets at amortised cost | Interest Rate And Forex Risk | - Derivatives      
Disclosure of detailed information about hedged items [line items]      
Hedged item, assets 13,802 8,272  
Accumulated fair value hedge adjustment remaining in statement of financial position for hedged item that ceased to be adjusted for hedging gains and losses, assets (179) (205)  
Change in fair value of the hedged item for measuring ineffectiveness for the period 49 234  
– Loans at FVOCI | Financial assets at FVOCI | Interest Rate And Forex Risk | - Derivatives      
Disclosure of detailed information about hedged items [line items]      
Change in fair value of the hedged item for measuring ineffectiveness for the period    
– Loans and advances to customers | Interest Rate And Forex Risk | - Derivatives      
Disclosure of detailed information about hedged items [line items]      
Hedged item, assets 1,149 898  
Accumulated fair value hedge adjustment remaining in statement of financial position for hedged item that ceased to be adjusted for hedging gains and losses, assets (6)    
Change in fair value of the hedged item for measuring ineffectiveness for the period (35) 15  
– Subordinated loans | Interest Rate And Forex Risk | - Derivatives      
Disclosure of detailed information about hedged items [line items]      
Hedged item, liabilities 17,131 14,643  
Accumulated fair value hedge adjustment remaining in statement of financial position for hedged item that ceased to be adjusted for hedging gains and losses, liabilities (665) (834)  
Change in fair value of the hedged item for measuring ineffectiveness for the period (188) (473)  
– Customer deposits and other funds on deposit | Interest Rate And Forex Risk | - Derivatives      
Disclosure of detailed information about hedged items [line items]      
Hedged item, liabilities 28 44  
Accumulated fair value hedge adjustment remaining in statement of financial position for hedged item that ceased to be adjusted for hedging gains and losses, liabilities (1) € (1)  
Change in fair value of the hedged item for measuring ineffectiveness for the period € 1