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Transfer of financial assets, assets pledged and received as collateral - Summary of assets pledged as collateral (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Assets Not Freely Disposable [line items]    
Financial assets pledged € 106,052 € 126,682
Financial assets at fair value through profit or loss    
Assets Not Freely Disposable [line items]    
Financial assets pledged 23,641 17,079
Financial assets at FVOCI    
Assets Not Freely Disposable [line items]    
Financial assets pledged 1,896 2,142
Securities at amortised cost    
Assets Not Freely Disposable [line items]    
Financial assets pledged 2,672 3,578
–  Cash and balances with central banks    
Assets Not Freely Disposable [line items]    
Financial assets pledged 322 364
–  Loans and advances to banks    
Assets Not Freely Disposable [line items]    
Financial assets pledged 3,305 4,007
Loans and advances to customers    
Assets Not Freely Disposable [line items]    
Financial assets pledged 73,860 98,917
Other assets    
Assets Not Freely Disposable [line items]    
Financial assets pledged € 357 € 596