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Payables and Other Non-current Liabilities - Non-Current Debt For Spectrum Acquisistion (Details) - EUR (€) € in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Trade And Other Payables [Line Items] |  |
Debt for spectrum acquisition | € 1,008 | € 1,184
Telefónica Spain |  |
Trade And Other Payables [Line Items] |  |
Debt for spectrum acquisition | 63 | 69
Telefónica Colombia |  |
Trade And Other Payables [Line Items] |  |
Debt for spectrum acquisition | 74 | 108
Telefónica Brazil |  |
Trade And Other Payables [Line Items] |  |
Debt for spectrum acquisition | 177 | 211
Telefónica Germany |  |
Trade And Other Payables [Line Items] |  |
Debt for spectrum acquisition | 690 | 791
Telefónica Uruguay |  |
Trade And Other Payables [Line Items] |  |
Debt for spectrum acquisition | € 4 | € 5

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