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Revenue and Expenses - Headcount (Details) - employee
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of operating segments [line items]      
Average employees over year 101,384 104,124 102,563
Employees at year-end 100,870 104,142 103,651
Telefónica Spain | Operating segments      
Disclosure of operating segments [line items]      
Average employees over year 19,055 21,342 21,099
Employees at year-end 18,305 21,443 20,947
Telefónica Germany | Operating segments      
Disclosure of operating segments [line items]      
Average employees over year 7,464 7,232 7,029
Employees at year-end 7,589 7,367 7,099
Telefónica Brazil | Operating segments      
Disclosure of operating segments [line items]      
Average employees over year 35,605 35,118 34,275
Employees at year-end 35,818 35,519 34,846
Telefónica Hispam | Operating segments      
Disclosure of operating segments [line items]      
Average employees over year 28,191 29,715 30,232
Employees at year-end 27,569 29,087 29,994
Other companies | Operating segments      
Disclosure of operating segments [line items]      
Average employees over year 11,069 10,717 9,928
Employees at year-end 11,589 10,726 10,765