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Property, Plant and Equipment - Narrative (Details)
€ in Millions, premise in Millions, home in Millions
 12 Months Ended
Dec. 15, 2022
home
Dec. 31, 2022
EUR (€)
premise
Dec. 31, 2021
EUR (€)
center
Jul. 21, 2021
center
May 07, 2021
center
Disclosure of detailed information about property, plant and equipment [line items]          
Investments in property, plant and equipment   € 4,289 € 3,880    
Number of premises covered by fiber optic roll out | home 5        
5G network population coverage (in percentage)   85.00%      
Impairment loss recognised in other comprehensive income, property, plant and equipment   € 59 5    
Acquisitions through business combinations, property, plant and equipment   37 15    
Transfers and others   (209) (416)    
Decrease through loss of control of subsidiary, property, plant and equipment     € 383    
Telefónica Infra, S.L. | Asterion Industrial Partners SGEIC          
Disclosure of detailed information about property, plant and equipment [line items]          
Number of data centers sold | center         4
Telefónica Infra, S.L. | Asterion Industrial Partners SGEIC | Spain          
Disclosure of detailed information about property, plant and equipment [line items]          
Number of data centers sold | center     2 2 2
Telefónica Spain          
Disclosure of detailed information about property, plant and equipment [line items]          
Investments in property, plant and equipment   € 1,288 € 1,155    
Number of premises covered by fiber optic roll out | premise   28.0      
Telefónica United Kingdom          
Disclosure of detailed information about property, plant and equipment [line items]          
Investments in property, plant and equipment     366    
Transfers and others     70    
Telefónica Germany          
Disclosure of detailed information about property, plant and equipment [line items]          
Investments in property, plant and equipment   € 854 913    
Population coverage by 5G networks (in percentage)   80.00%      
Telefónica Brazil          
Disclosure of detailed information about property, plant and equipment [line items]          
Investments in property, plant and equipment   € 1,277 1,049    
Population covered in 4G network (in percentage)   96.00%      
Number of premises covered by FTTH network | premise   23.3      
Telefónica Hispam          
Disclosure of detailed information about property, plant and equipment [line items]          
Investments in property, plant and equipment   € 732 680    
Telefónica México          
Disclosure of detailed information about property, plant and equipment [line items]          
Increase (decrease) in depreciation, property, plant and equipment   8 47    
Telxius Group          
Disclosure of detailed information about property, plant and equipment [line items]          
Transfers and others     53    
Telefónica Argentina          
Disclosure of detailed information about property, plant and equipment [line items]          
Impairment loss recognised in other comprehensive income, property, plant and equipment   56      
Cancom Ltd.          
Disclosure of detailed information about property, plant and equipment [line items]          
Acquisitions through business combinations, property, plant and equipment     15    
InfraCo, SpA          
Disclosure of detailed information about property, plant and equipment [line items]          
Decrease through loss of control of subsidiary, property, plant and equipment     158    
Telefónica Germany          
Disclosure of detailed information about property, plant and equipment [line items]          
Decrease through loss of control of subsidiary, property, plant and equipment     126    
Oi Group          
Disclosure of detailed information about property, plant and equipment [line items]          
Acquisitions through business combinations, property, plant and equipment   29      
Incremental          
Disclosure of detailed information about property, plant and equipment [line items]          
Acquisitions through business combinations, property, plant and equipment   1      
BE-terna          
Disclosure of detailed information about property, plant and equipment [line items]          
Acquisitions through business combinations, property, plant and equipment   € 6      
Deferred collection sale of T. Ireland | InfraCo, SpA          
Disclosure of detailed information about property, plant and equipment [line items]          
Decrease through loss of control of subsidiary, property, plant and equipment     36    
Deferred collection sale of T. Ireland | Telefónica Germany          
Disclosure of detailed information about property, plant and equipment [line items]          
Decrease through loss of control of subsidiary, property, plant and equipment     € 63