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Provisions - Detail by segments of provisions for dismantling of assets (Details) - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of other provisions [line items]      
Other provisions € 2,189 € 2,574  
Dismantling of assets      
Disclosure of other provisions [line items]      
Other provisions 535 522 € 528
Telefónica Spain | Dismantling of assets | Operating segments      
Disclosure of other provisions [line items]      
Other provisions 14 16  
Telefónica Germany | Dismantling of assets | Operating segments      
Disclosure of other provisions [line items]      
Other provisions 360 354  
Telefónica Brazil      
Disclosure of other provisions [line items]      
Other provisions 877 1,229  
Telefónica Brazil | Dismantling of assets | Operating segments      
Disclosure of other provisions [line items]      
Other provisions 64 76  
Telefónica Hispam | Dismantling of assets | Operating segments      
Disclosure of other provisions [line items]      
Other provisions € 97 € 76