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Derivative Financial Instruments and Risk Management Policies - Breakdown of Financial Results Narrative (Details) € in Millions, R$ in Millions, $ in Millions |  | 12 Months Ended
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Apr. 12, 2024 | Dec. 31, 2024 EUR (€) | Dec. 31, 2024 USD ($) | Dec. 31, 2024 BRL (R$) | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€)
Disclosure of financial assets [line items] |  |  |  |  |  |
Increase (reduction) to finance income due to decisions with tax authorities |  |  |  |  |  | € 139
Republic of Colombia |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |
Damages penalty percentage | 0.05 | 0.05 | 0.05 | 0.05 |  |
Republic of Colombia | Legal proceedings contingent liability |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |
Damages penalty percentage |  | 0.05 | 0.05 | 0.05 |  |
Derivative instruments |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |
Other financial income |  | € 326 |  |  | € 349 | 894
Accretion of provisions and other liabilities |  | (389) |  |  | (489) | 276
Derivative instruments | Telefónica Brazil |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |
Other financial income |  |  |  |  | € 46 |
Accretion of provisions and other liabilities |  | 70 |  | R$ 406 |  |
Derivative instruments | Republic of Colombia |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |
Other financial income |  | € 154 | $ 164 |  |  |
Derivative instruments | Spain |  |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |  |
Other financial income |  |  |  |  |  | € 526

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