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Segment Information - Narrative (Details) - EUR (€) € in Millions |  |  |  | 2 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2021 | Jun. 01, 2021 | May 07, 2020 | Aug. 02, 2021 | Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Gain on disposal of businesses |  |  |  |  |  | € 205 | € 11,008 | € 67
VMO2 |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Proportion of ownership interest in joint venture (as a percent) | 50.00% |  |  |  | 50.00% | 50.00% | 50.00% |
Telefónica O2 Holdings Ltd. Holding company |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Gain on disposal of businesses |  | € 4,460 |  |  |  |  |  |
Telefónica O2 Holdings Ltd. Holding company | VMO2 |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Proportion of ownership interest in joint venture (as a percent) |  | 50.00% | 50.00% |  |  |  |  |
Telxius Telecom, S.A. | Europe and Latin America towers division |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Gain on disposal of businesses |  |  |  | € 6,099 |  |  |  |

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