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Revenue and Expenses - Headcount (Details) - employee
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of operating segments [line items]      
Average employees over year 102,563 107,776 113,182
Employees at year-end 103,651 104,150 112,797
Percentage of female employees 39.00% 38.00%  
Telefonica Tech UK Limited      
Disclosure of operating segments [line items]      
Average employees over year 609    
Incremental      
Disclosure of operating segments [line items]      
Average employees over year 330    
BE-terna      
Disclosure of operating segments [line items]      
Average employees over year 954    
Operating segments      
Disclosure of operating segments [line items]      
Number of employees with disabilities 1,482 1,128  
Telefónica Spain | Operating segments      
Disclosure of operating segments [line items]      
Average employees over year 21,099 22,872 22,992
Employees at year-end 20,947 22,976 22,978
Number of employees with disabilities 314 267  
Telefónica United Kingdom | Operating segments      
Disclosure of operating segments [line items]      
Average employees over year 0 2,884 6,501
Employees at year-end 0 0 6,318
Telefónica Germany | Operating segments      
Disclosure of operating segments [line items]      
Average employees over year 7,029 7,375 7,770
Employees at year-end 7,099 7,056 7,701
Telefónica Brazil | Operating segments      
Disclosure of operating segments [line items]      
Average employees over year 34,275 33,987 33,938
Employees at year-end 34,846 34,343 33,828
Telefónica Hispam | Operating segments      
Disclosure of operating segments [line items]      
Average employees over year 30,232 31,806 33,872
Employees at year-end 29,994 30,717 33,506
Other companies | Operating segments      
Disclosure of operating segments [line items]      
Average employees over year 9,928 8,852 8,109
Employees at year-end 10,765 9,058 8,466