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Provisions - Provisions for Tax Proceedings (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of other provisions [line items]    
Other provisions at beginning of period € 2,574  
Other provisions at end of period 2,189 € 2,574
Brazil    
Disclosure of other provisions [line items]    
Other provisions at beginning of period 1,229  
Other provisions at end of period 877 1,229
Brazil | Tax proceedings    
Disclosure of other provisions [line items]    
Other provisions at beginning of period 515 446
Movements with a corresponding entry under operating income 7  
Other additions/reversal (84) 16
Write-offs due to payment (12) (3)
Business combination 9  
Monetary updating (46) 38
Translation differences (75) 18
Other provisions at end of period € 314 € 515