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Transfer of financial assets, assets pledged and received as collateral - Schedule of transfer of financial assets not qualifying for derecognition (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Sale and repurchase, equity    
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]    
Associated liabilities at carrying amount € 11,010 € 6,245
Sale and repurchase, debt    
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]    
Associated liabilities at carrying amount 9,467 8,932
Financial assets at fair value through profit or loss | Securities lending, equity    
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]    
Transferred assets at carrying amount 3,894 2,087
Financial assets at fair value through profit or loss | Sale and repurchase, equity    
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]    
Transferred assets at carrying amount 7,357 6,357
Financial assets at fair value through profit or loss | Sale and repurchase, debt    
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]    
Transferred assets at carrying amount 11,780 7,178
Financial assets at FVOCI | Securities lending, debt    
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]    
Transferred assets at carrying amount 328 499
Financial assets at FVOCI | Sale and repurchase, debt    
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]    
Transferred assets at carrying amount 470 453
Loans and advances to customers | Sale and repurchase, debt    
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]    
Transferred assets at carrying amount 2,396 4,637
Securities at amortised cost | Securities lending, debt    
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]    
Transferred assets at carrying amount 431 435
Securities at amortised cost | Sale and repurchase, debt    
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]    
Transferred assets at carrying amount € 465 € 261