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Provisions - Provisions Narrative (Details)
€ in Millions, R$ in Millions
Dec. 31, 2023
EUR (€)
Dec. 31, 2023
BRL (R$)
Dec. 31, 2022
EUR (€)
Dec. 31, 2022
BRL (R$)
Disclosure of other provisions [line items]        
Other provisions € 2,574   € 2,630  
Regulatory proceedings        
Disclosure of other provisions [line items]        
Other provisions 1,264 R$ 6,765 1,049 R$ 5,845
Civil Proceedings        
Disclosure of other provisions [line items]        
Estimated financial effect of contingent liabilities 398   391  
Brazil        
Disclosure of other provisions [line items]        
Other provisions 1,229   1,300  
Brazil | Tax contingent liability        
Disclosure of other provisions [line items]        
Estimated financial effect of contingent liabilities 6,909 36,963 6,009 33,473
Brazil | Regulatory proceedings        
Disclosure of other provisions [line items]        
Other provisions 329 R$ 1,761 336 R$ 1,869
Brazil | Vivo | Goodwill amortized for tax        
Disclosure of other provisions [line items]        
Other provisions € 187   € 176