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Provisions - Provisions Brazil Narrative (Details)
€ in Millions, R$ in Millions
 12 Months Ended
Dec. 31, 2024
EUR (€)
Dec. 31, 2024
BRL (R$)
Dec. 31, 2023
EUR (€)
Dec. 31, 2022
EUR (€)
Dec. 31, 2024
BRL (R$)
Dec. 31, 2023
BRL (R$)
Disclosure of other provisions [line items]            
Other provisions € 2,189   € 2,574      
Other expenses 12,554   10,298 € 10,741    
Finance income 980   1,099 € 1,803    
Regulatory proceedings            
Disclosure of other provisions [line items]            
Other provisions 476   1,264   R$ 3,067 R$ 6,765
Civil Proceedings            
Disclosure of other provisions [line items]            
Estimated financial effect of contingent liabilities 311   398      
Brazil            
Disclosure of other provisions [line items]            
Other provisions 877   1,229      
Brazil | Tax contingent liability            
Disclosure of other provisions [line items]            
Estimated financial effect of contingent liabilities 6,347   6,909   40,850 36,963
Brazil | Regulatory proceedings            
Disclosure of other provisions [line items]            
Other provisions 179   329   R$ 1,151 R$ 1,761
Unused provision reversed, other provisions 137 R$ 792        
Other expenses 67 386        
Finance income 70 R$ 406        
Brazil | Vivo | Goodwill amortized for tax            
Disclosure of other provisions [line items]            
Other provisions € 167   € 187