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Acquisitions and disposals - Disclosure of Impact of Acquisitions (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about business combination [line items]      
Net assets acquired € 368    
Non-controlling interest (20)    
Goodwill 327    
Total consideration 675 € 811  
Total acquisitions      
Disclosure of detailed information about business combination [line items]      
Net assets acquired 368 487 € 1,372
Non-controlling interest (20) (99) (14)
Goodwill 327 580 759
Total consideration € 675 € 968 € 2,117