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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about hedged items [line items]      
Change in fair value hedging instruments for the period € 1,606 € (5,928) € (1,317)
Interest rate risk | Derivatives      
Disclosure of detailed information about hedged items [line items]      
Hedged item, assets 40,394 24,794  
Hedged item, liabilities 84,967 76,199  
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 91 261  
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 (4) (2)  
Change in fair value of the hedged item for measuring ineffectiveness for the period (1,679) 5,563  
Change in fair value hedging instruments for the period 1,606 (5,928)  
Hedge ineffectiveness recognised in the statement of profit or loss gain (+) / loss (-) (73) (365)  
Carrying amount net investment hedge reserve at the end of the reporting period (113) (208)  
Accumulated fair value hedge adjustment on hedged item included in carrying amount, liabilities (4,221) (7,468)  
Debt securities | Interest rate risk | Derivatives      
Disclosure of detailed information about hedged items [line items]      
Hedged item, liabilities 70,280 61,449  
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 (3,383) (6,122)  
Change in fair value of the hedged item for measuring ineffectiveness for the period (2,680) 7,658  
Debt securities | Financial assets at FVOCI | Interest rate risk | Derivatives      
Disclosure of detailed information about hedged items [line items]      
Hedged item, assets 31,224 19,816  
Change in fair value of the hedged item for measuring ineffectiveness for the period 1,224 (2,798)  
Debt securities | Financial assets at amortised cost | Interest rate risk | Derivatives      
Disclosure of detailed information about hedged items [line items]      
Hedged item, assets 8,272 4,098  
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 (205) (448)  
Change in fair value of the hedged item for measuring ineffectiveness for the period 234 (678)  
– Loans and advances to customers | Interest rate risk | Derivatives      
Disclosure of detailed information about hedged items [line items]      
Hedged item, assets 898 879  
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   (20)  
Change in fair value of the hedged item for measuring ineffectiveness for the period 15 (90)  
– Subordinated loans | Interest rate risk | Derivatives      
Disclosure of detailed information about hedged items [line items]      
Hedged item, liabilities 14,643 14,750  
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 (834) (1,344)  
Change in fair value of the hedged item for measuring ineffectiveness for the period (473) 1,470  
– Customer deposits and other funds on deposit | Interest rate risk | Derivatives      
Disclosure of detailed information about hedged items [line items]      
Hedged item, liabilities 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)    
Change in fair value of the hedged item for measuring ineffectiveness for the period   € 2