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Provisions - Summary of provisions by type (Details) - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of other provisions [line items]      
Other provisions € 774 € 920  
Other provisions before loan loss 628 779 € 1,022
Reorganisation provisions      
Disclosure of other provisions [line items]      
Other provisions 201 231  
Other provisions before loan loss 201 231 418
Litigation provisions      
Disclosure of other provisions [line items]      
Other provisions 288 193  
Other provisions before loan loss 288 193 150
Other provisions      
Disclosure of other provisions [line items]      
Other provisions 139 355  
Other provisions before loan loss 139 355 € 455
Loan loss provisions for guarantees      
Disclosure of other provisions [line items]      
Other provisions € 146 € 142