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Basis of Presentation of the Consolidated Financial Statements - Arbitration Telefónica vs Republic of Colombia (Details) € in Millions, $ in Millions |  | 12 Months Ended
--- | --- | ---
Apr. 12, 2024 | Dec. 31, 2024 EUR (€) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€)
Disclosure of contingent liabilities [line items] |  |  |  |  |
Other operating income and expenses |  | € 625 |  | € 428 | € 478
Republic of Colombia |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |
Other operating income and expenses |  | € 358 | $ 380 |  |
Damages penalty percentage | 0.05 | 0.05 | 0.05 |  |
Interest receivable |  | € 154 |  |  |

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