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Goodwill - Allocation of Goodwill to Cash-Generating Units (Details) - Goodwill - EUR (€) € in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets and goodwill | € 18,471 | € 16,519 | € 17,044
Telefónica Spain | Operating segments |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets and goodwill | 4,291 | 4,291 | 4,299
Telefónica Brazil | Operating segments |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets and goodwill | 7,752 | 6,278 | 6,258
Telefónica Germany | Operating segments |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets and goodwill | 4,386 | 4,386 | 4,558
Telefónica Hispam | Operating segments |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets and goodwill | 1,215 | 1,166 | 1,778
Telefónica Hispam | Operating segments | Colombia |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets and goodwill | 135 | 154 |
Telefónica Hispam | Operating segments | Ecuador |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets and goodwill | 137 | 129 |
Telefónica Hispam | Operating segments | Chile |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets and goodwill | 652 | 622 |
Telefónica Hispam | Operating segments | Peru |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets and goodwill | 265 | 239 |
Telefónica Hispam | Operating segments | Uruguay |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets and goodwill | 23 | 20 |
Telefónica Hispam | Operating segments | Others T. Hispam |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets and goodwill | 3 | 2 |
Other companies | Operating segments |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets and goodwill | 827 | 398 | € 151
Other companies | Operating segments | Telefónica Tech UK & Ireland |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets and goodwill | 429 | 288 |
Other companies | Operating segments | BE-terna |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets and goodwill | 279 | 0 |
Other companies | Operating segments | Others |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets and goodwill | € 119 | € 110 |

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