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Equity - Other Equity Instruments Narrative (Details) - EUR (€) € in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Oct. 31, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2024
Retained earnings |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Payments on undated deeply subordinated securities |  |  |  | € 249 | € 239 | € 201 |
Telefónica Europe, B.V. Fund raising in capital markets |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Amount repurchased | € 203 | € 1,097 | € 200 |  |  |  |
Subordinated securities, issued January 2023 | Cost |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Borrowings |  | € 1,100 |  |  |  |  |
Subordinated securities, issued September 2023 | Cost |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  | € 750

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