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Provisions - Provisions for Tax Proceedings (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of other provisions [line items]    
Other provisions at beginning of period € 2,630  
Other provisions at end of period 2,574 € 2,630
Brazil    
Disclosure of other provisions [line items]    
Other provisions at beginning of period 1,300  
Other provisions at end of period 1,229 1,300
Brazil | Tax proceedings    
Disclosure of other provisions [line items]    
Other provisions at beginning of period 446 340
Movements with a counterparty in operating income 16 31
Write-offs due to payment (3) (6)
Monetary updating 38 37
Translation differences 18 44
Other provisions at end of period € 515 € 446