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Operations Classified as Held for Sale - Narrative (Details)
€ in Millions, $ in Millions
Jan. 13, 2022
USD ($)
Jan. 13, 2022
EUR (€)
Oct. 14, 2021
Telefónica Centroamérica Inversiones ,S.L. | Telefónica, S.A.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary (as a percent)     60.00%
Telefónica Centroamérica Inversiones ,S.L. | Corporacion Multi Inversiones, SA      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary (as a percent)     40.00%
Telefónica El Salvador | General International Telecom El Salvador, S.A. De C.V. | Telefónica Centroamérica Inversiones ,S.L.      
Disclosure of subsidiaries [line items]      
Proportion of voting equity transferred (as a percent) 9930.00% 9930.00%  
Consideration received $ 139 € 121