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Associates and Joint Ventures - Breakdown of Key Financial Highlights (Details) - EUR (€) € in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |
Assets | € 109,642 | € 109,213 |  |
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract] |  |  |  |
Group’s share in equity | 31,708 | 28,684 | € 18,260 | € 25,450
Goodwill | 18,471 | 16,519 |  |
Carrying amount in the Telefónica Group | 312 | 251 |  |
Prosegur Soluciones S.A.U. | Movistar Prosegur Alarmas |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |
Assets | 352 | 224 |  |
Liabilities | 346 | 202 |  |
Net assets | 6 | 22 |  |
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract] |  |  |  |
Assets | 136 | 146 |  |
Liabilities | 35 | 38 |  |
Liabilities assumed and other costs (see Note 29.c) | € 101 | € 108 |  |
Proportion of ownership interest in joint venture (as a percent) | 50.00% | 50.00% |  |
Group’s share in equity | € 54 | € 65 |  |
Goodwill | 198 | 198 |  |
Carrying amount in the Telefónica Group | € 252 | € 263 |  |

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