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Revenue and Expenses - Headcount (Details) - employee
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of operating segments [line items]      
Average employees over year 104,124 102,563 107,776
Employees at year-end 104,142 103,651 104,150
Percentage of female employees 39.00% 39.00%  
Operating segments      
Disclosure of operating segments [line items]      
Number of employees with disabilities 2,572 1,482  
Telefónica Spain | Operating segments      
Disclosure of operating segments [line items]      
Average employees over year 21,342 21,099 22,872
Employees at year-end 21,443 20,947 22,976
Number of employees with disabilities 462 314  
Telefónica United Kingdom | Operating segments      
Disclosure of operating segments [line items]      
Average employees over year 0 0 2,884
Employees at year-end 0 0 0
Telefónica Germany | Operating segments      
Disclosure of operating segments [line items]      
Average employees over year 7,232 7,029 7,375
Employees at year-end 7,367 7,099 7,056
Telefónica Brazil | Operating segments      
Disclosure of operating segments [line items]      
Average employees over year 35,118 34,275 33,987
Employees at year-end 35,519 34,846 34,343
Telefónica Hispam | Operating segments      
Disclosure of operating segments [line items]      
Average employees over year 29,715 30,232 31,806
Employees at year-end 29,087 29,994 30,717
Other companies | Operating segments      
Disclosure of operating segments [line items]      
Average employees over year 10,717 9,928 8,852
Employees at year-end 10,726 10,765 9,058