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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 |  |  |

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