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Other Information - Commitments Bluevia Fibra (Details) € in Millions, realEstate in Millions | Dec. 20, 2022 EUR (€) realEstate | Apr. 20, 2022 EUR (€)
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Telefónica, S.A. | Bluevia Fibra S.L.U. |  |
Commitments [Line Items] |  |
Proportion of voting rights held in subsidiary (as a percent) | 55.00% |
Telefónica España Filiales | Bluevia Fibra S.L.U. |  |
Commitments [Line Items] |  |
Proportion of voting rights held in subsidiary (as a percent) | 30.00% |
Telefonica Indra, S.L. | Bluevia Fibra S.L.U. |  |
Commitments [Line Items] |  |
Proportion of voting rights held in subsidiary (as a percent) | 25.00% |
Equity funds contributed | € | € 1,247 |
Vauban/CAA | Bluevia Fibra S.L.U. |  |
Commitments [Line Items] |  |
Proportion of voting rights held in subsidiary (as a percent) | 45.00% |
Total | € |  | € 1,021
Vauban/CAA | Bluevia Fibra S.L.U. | Telefónica, S.A. |  |
Commitments [Line Items] |  |
Total | € | € 1,021 |
Bluevia Fibra S.L.U. | Telefónica, S.A. |  |
Commitments [Line Items] |  |
Purchase of real estate units | realEstate | 3.9 |
Number of real estate units to deploy in future | realEstate | 1.1 |
Period in which real estate units will be deployed | 2 years |
Expected ownership of real estate unit | realEstate | 5.0 |
Purchase of real estate units, to total network (in percentage) | 14.00% |

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