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Other Current Financial Assets - Narrative (Details) € in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 EUR (€) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€) | Dec. 31, 2024 USD ($)
Disclosure of financial assets [line items] |  |  |  |  |
Current financial assets | € 1,800 |  | € 1,078 |  |
Other income | 1,692 |  | 1,541 | € 2,065 |
Finance income | 980 |  | 1,099 | € 1,803 |
Short-term credits |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Current financial assets | 893 |  | 192 |  |
Other income | 358 | $ 380 |  |  |
Finance income | 154 | $ 164 |  |  |
Deposits and guarantees |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Current financial assets | 139 |  | 209 |  |
Other current financial assets - short-term investments |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Current financial assets | 228 |  | 187 |  |
American Tower Cooperation | Short-term credits |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Current financial assets | 90 |  |  |  |
Republic of Colombia | Short-term credits |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Current financial assets | 523 |  |  |  | $ 544
Telefónica, S.A. |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Current financial assets | 1,800 |  | 1,078 |  |
Telefónica, S.A. | Deposits and guarantees |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Current financial assets | € 39 |  | € 50 |  |

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