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Property and equipment - Schedule of property and equipment (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about property, plant and equipment [line items]      
Total property and equipment € 2,399 € 2,446 € 2,515
Property      
Disclosure of detailed information about property, plant and equipment [line items]      
Total property and equipment by type 616 681  
Right-of-use assets 972 1,000  
Total property and equipment 616 681 702
Equipment      
Disclosure of detailed information about property, plant and equipment [line items]      
Total property and equipment 705 688 € 699
- Data processing equipment      
Disclosure of detailed information about property, plant and equipment [line items]      
Total property and equipment by type 213 213  
- Other equipment      
Disclosure of detailed information about property, plant and equipment [line items]      
Total property and equipment by type 492 476  
- ROU cars      
Disclosure of detailed information about property, plant and equipment [line items]      
Right-of-use assets 97 64  
- ROU other leases      
Disclosure of detailed information about property, plant and equipment [line items]      
Right-of-use assets € 9 € 12