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Financial Assets and Other Non-current Assets - Narrative (Details)
€ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
EUR (€)
bond
Dec. 31, 2023
EUR (€)
bond
Dec. 31, 2022
EUR (€)
Dec. 31, 2023
CLP ($)
Dec. 14, 2023
Disclosure of financial assets [line items]          
Contractual limit amount € 84,933 € 81,097      
Proceeds on financial investments not included under cash equivalents 1,413 1,432 € 2,967    
Current financial assets 1,800 1,078      
Bonds issued   29,779      
Non-current financial assets 5,339 5,201      
Long-term financial instruments of Pegaso PCS          
Disclosure of financial assets [line items]          
Proceeds on financial investments not included under cash equivalents 0 287 0    
Other long-term credits          
Disclosure of financial assets [line items]          
Transfers and other (139) (53)      
Additions 132 114      
Non-current financial assets 602 741 981    
Collateral guarantees on derivatives          
Disclosure of financial assets [line items]          
Current financial assets 108 273      
Currency swaps          
Disclosure of financial assets [line items]          
Current financial assets 55        
Trade receivables          
Disclosure of financial assets [line items]          
Transfers and other (304) (315)      
Additions 623 610      
Non-current financial assets 945 1,049 € 1,019    
Trade receivables | Onnet Fibra Colombia S.A.S.          
Disclosure of financial assets [line items]          
Additions 14 29      
Short-term credits          
Disclosure of financial assets [line items]          
Current financial assets 893 192      
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 200 280      
Alamo HoldCo S.L. (Onnet Fibra Colombia)          
Disclosure of financial assets [line items]          
Contractual limit amount 112 112      
Sale of Telecommunications towers divisions of Telxius | Other long-term credits          
Disclosure of financial assets [line items]          
Transfers and other € 90 € 269      
Telefónica Emisiones, S.A.U.          
Disclosure of financial assets [line items]          
Number of bonds issued | bond 59,808 51,988      
Bonds issued € 58 € 47      
Telefónica Germany          
Disclosure of financial assets [line items]          
Long-term financial assets 120 114      
Telefonica Brasil, S.A.          
Disclosure of financial assets [line items]          
Long-term deposits 443 531      
BBVA          
Disclosure of financial assets [line items]          
Investments in associates € 417 € 363      
Proportion of ownership interest in associate (as a percent) 0.77% 0.76%      
Sale of China Unicom shares (Note 12)          
Disclosure of financial assets [line items]          
Investments in associates   € 103      
Proportion of ownership interest in associate (as a percent)   0.59%      
Reserve of gains and losses on financial assets measured at fair value through other comprehensive income € 110        
HoldCo Infraco SpA. (Onnet Fibra Chile)          
Disclosure of financial assets [line items]          
Proportion of ownership interest in associate (as a percent) 40.00%        
HoldCo Infraco SpA. (Onnet Fibra Chile) | Telefónica Chile, S.A. Local and international long distance telephony services provider          
Disclosure of financial assets [line items]          
Credits and other financial assets € 118 € 121      
Proportion of ownership interest in joint venture, disposal 0.40       0.40
HoldCo Infraco SpA. (Onnet Fibra Chile) | Telefónica Chile, S.A. Local and international long distance telephony services provider | Loans and receivables          
Disclosure of financial assets [line items]          
Long-term financial assets € 43 46   $ 44,187  
Credits and other financial assets € 75 € 75