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Financial Assets and Other Non-current Assets - Narrative (Details)
€ in Millions, $ in Millions
 12 Months Ended
May 19, 2022
shares
Dec. 31, 2022
EUR (€)
bond
Dec. 31, 2021
EUR (€)
bond
Dec. 31, 2022
USD ($)
Dec. 31, 2020
EUR (€)
Disclosure of financial assets [line items]          
Contractual limit amount   € 83,706 € 84,794    
Current financial assets   2,444 3,835    
Bonds issued   31,095 32,156    
Non-current financial assets   6,219 6,062    
Long-term credits          
Disclosure of financial assets [line items]          
Transfers and other   (384) (47)    
Non-current financial assets   981 890   € 252
Additions   503 686    
Collateral guarantees on derivatives          
Disclosure of financial assets [line items]          
Current financial assets   365 564    
Currency swaps          
Disclosure of financial assets [line items]          
Current financial assets   42 279    
Trade receivables          
Disclosure of financial assets [line items]          
Transfers and other   (197) (65)    
Non-current financial assets   1,019 752   € 551
Additions   616 540    
Trade receivables | Onnet Fibra Colombia S.A.S.          
Disclosure of financial assets [line items]          
Non-current financial assets   59      
Additions   69      
Financial assets at fair value through other comprehensive income, category [member] | Trade receivables | Telefónica Germany          
Disclosure of financial assets [line items]          
Non-current financial assets   292 269    
Spire Notes          
Disclosure of financial assets [line items]          
Contractual limit amount   939 1,000 $ 1,000  
Other long-term credits     295    
Other current financial assets   939 591    
Transfers and other   313      
Pegaso PCS S.A. de CV | Federal Treasury Certificates [Member]          
Disclosure of financial assets [line items]          
Contractual limit amount   260      
Alamo HoldCo S.L.          
Disclosure of financial assets [line items]          
Contractual limit amount   82      
Telxius Towers | Long-term credits          
Disclosure of financial assets [line items]          
Transfers and other   € 264 € 246    
Telefónica Emisiones, S.A.U.          
Disclosure of financial assets [line items]          
Number of bonds issued | bond   79,034 166,678    
Bonds issued   € 78 € 173    
Telefónica Germany          
Disclosure of financial assets [line items]          
Long-term financial assets   104 85    
Telefónica Brasil, S.A.          
Disclosure of financial assets [line items]          
Long-term deposits   501 431    
BBVA          
Disclosure of financial assets [line items]          
Investments in associates   € 249 € 232    
Proportion of ownership interest in associate (as a percent)   0.73% 0.66%    
China Unicom Broadban Online Limited Corp. [Member]          
Disclosure of financial assets [line items]          
Investments in associates   € 105 € 80    
Proportion of ownership interest in associate (as a percent)   0.59% 0.59%    
Promotora de informaciones, S.A. (Prisa)          
Disclosure of financial assets [line items]          
Investments in associates   € 4 € 36    
Proportion of ownership interest in associate (as a percent)   1.87% 9.03%    
Number of shares sold, investments in associates (in shares) | shares 50,147,058        
Increase (decrease) proportion of ownership interest in associate (in percent) 7.076%        
Reserve of gains and losses on financial assets measured at fair value through other comprehensive income   € 71      
InfraCo, SpA          
Disclosure of financial assets [line items]          
Proportion of ownership interest in associate (as a percent)   40.00%      
InfraCo, SpA | Telefónica Chile, S.A.          
Disclosure of financial assets [line items]          
Proportion of ownership interest in joint venture, disposal     0.40    
InfraCo, SpA | Telefónica Chile, S.A. | Loans and receivables, category [member]          
Disclosure of financial assets [line items]          
Long-term credits to associates and joint ventures   € 75 € 87