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Equity - Dividends Narrative (Details) € / shares in Units, € in Millions |  |  |  |  |  |  |  |  |  | 6 Months Ended | 12 Months Ended |
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Dec. 19, 2024 EUR (€) € / shares | Jun. 20, 2024 EUR (€) € / shares | Apr. 12, 2024 tranche € / shares | Dec. 14, 2023 EUR (€) € / shares | Jun. 15, 2023 EUR (€) € / shares | Mar. 31, 2023 tranche € / shares | Dec. 15, 2022 EUR (€) € / shares | May 25, 2022 EUR (€) allotmentRight | Apr. 08, 2022 tranche € / shares | Dec. 31, 2022 shares | Dec. 31, 2024 EUR (€) € / shares | Dec. 31, 2023 EUR (€) € / shares | Dec. 31, 2022 EUR (€) | Jun. 24, 2022 € / shares
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid (EUR per share) | € / shares | € 0.15 | € 0.15 | € 0.30 | € 0.15 | € 0.15 | € 0.30 | € 0.15 |  | € 0.30 |  |  |  |  |
Number of tranches for dividends payable | tranche |  |  | 2 |  |  | 2 |  |  | 2 |  |  |  |  |
Dividends paid, total amount | € 847 | € 846 |  | € 847 | € 851 |  |  |  |  |  |  |  |  |
Number of free-of-charge allotment rights per share | allotmentRight |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Free-of-charge allotment rights, trading period |  |  |  |  |  |  |  | 15 days |  |  |  |  |  |
Profit (loss) for the year |  |  |  |  |  |  |  |  |  |  | € 209 | € (574) | € 2,319 |
Telefónica, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Profit (loss) for the year |  |  |  |  |  |  |  |  |  |  | € 563 |  |  |
Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid, total amount |  |  |  |  |  |  | € 854 | € 213 |  |  |  |  |  |
Proportion of shareholders issued free-of-charge allotment rights issued in cash (as a percent) |  |  |  |  |  |  |  | 25.54% |  |  |  |  |  |
Percentage of shareholders issued free-of-charge allotment rights issued in shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 74.46%
Increase (decrease) in number of shares outstanding (shares) | shares |  |  |  |  |  |  |  |  |  | 135,464,591 |  |  |  |
Par value per share (EUR per share) | € / shares |  |  | € 1 |  |  |  |  |  |  |  | € 1 | € 1 |  | € 1

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