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Other Information - Environmental and climate change matters Narrative (Details) - EUR (€) € in Millions | Dec. 31, 2024 | Sep. 30, 2024 | Mar. 31, 2024 | Jan. 31, 2024 | Dec. 31, 2023 | Nov. 30, 2023 | Sep. 30, 2023 | Jan. 01, 2022
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Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Notes and debentures issued | € 30,979 |  |  |  |  |  |  |
Contractual limit amount | 84,933 |  |  |  | € 81,097 |  |  |
Telefónica, S.A. |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Borrowings | 32,704 |  |  |  |  |  |  |
Sustainable Financing |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Notes and debentures issued | 3,050 |  |  |  |  | € 2,600 |  |
Borrowings | 21,447 |  |  |  | € 18,796 |  |  |
Sustainable Financing | Hybrid Bond |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Notes and debentures issued |  | € 750 | € 1,100 | € 1,750 |  |  | € 200 |
Sustainable Financing | Sustainable Loan | Telefónica, S.A. |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Contractual limit amount |  |  |  |  |  |  |  | € 5,500
Sustainable Financing | Committed Credit Facilities and Bilateral Loans | Telefónica, S.A. |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Borrowings | € 4,343 |  |  |  |  |  |  |

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