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Provisions - Provisions by Segment (Details) - EUR (€)
€ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of other provisions [line items]      
Other provisions € 2,630 € 2,128  
Dismantling of assets      
Disclosure of other provisions [line items]      
Other provisions 528 577 € 677
Telefónica Spain | Dismantling of assets | Operating segments      
Disclosure of other provisions [line items]      
Other provisions 18 21  
Telefónica Germany | Dismantling of assets | Operating segments      
Disclosure of other provisions [line items]      
Other provisions 323 396  
Telefónica Brazil      
Disclosure of other provisions [line items]      
Other provisions 1,300 879  
Telefónica Brazil | Dismantling of assets | Operating segments      
Disclosure of other provisions [line items]      
Other provisions 71 60  
Telefónica Hispam | Dismantling of assets | Operating segments      
Disclosure of other provisions [line items]      
Other provisions € 116 € 100