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Provisions - Summary of provisions by type (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of other provisions [line items]      
Other provisions € 920 € 1,052  
Other provisions before loan loss 779 1,022 € 961
Reorganisation provisions      
Disclosure of other provisions [line items]      
Other provisions 231 418  
Other provisions before loan loss 231 418 421
Litigation provisions      
Disclosure of other provisions [line items]      
Other provisions 193 150  
Other provisions before loan loss 193 150 € 132
Other provisions      
Disclosure of other provisions [line items]      
Other provisions 355 455  
Loan loss provisions for guarantees      
Disclosure of other provisions [line items]      
Other provisions € 142 € 29