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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 |  |

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