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Provisions - Provisions by Segment (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of other provisions [line items]      
Other provisions € 2,574 € 2,630  
Dismantling of assets      
Disclosure of other provisions [line items]      
Other provisions 522 528 € 577
Telefónica Spain | Dismantling of assets | Operating segments      
Disclosure of other provisions [line items]      
Other provisions 16 18  
Telefónica Germany | Dismantling of assets | Operating segments      
Disclosure of other provisions [line items]      
Other provisions 354 323  
Telefónica Brazil      
Disclosure of other provisions [line items]      
Other provisions 1,229 1,300  
Telefónica Brazil | Dismantling of assets | Operating segments      
Disclosure of other provisions [line items]      
Other provisions 76 71  
Telefónica Hispam | Dismantling of assets | Operating segments      
Disclosure of other provisions [line items]      
Other provisions € 76 € 116