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Revenue and Expenses - Headcount (Details) - employee | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of operating segments [line items] |  |  |
Average employees over year | 101,384 | 104,124 | 102,563
Employees at year-end | 100,870 | 104,142 | 103,651
Telefónica Spain | Operating segments |  |  |
Disclosure of operating segments [line items] |  |  |
Average employees over year | 19,055 | 21,342 | 21,099
Employees at year-end | 18,305 | 21,443 | 20,947
Telefónica Germany | Operating segments |  |  |
Disclosure of operating segments [line items] |  |  |
Average employees over year | 7,464 | 7,232 | 7,029
Employees at year-end | 7,589 | 7,367 | 7,099
Telefónica Brazil | Operating segments |  |  |
Disclosure of operating segments [line items] |  |  |
Average employees over year | 35,605 | 35,118 | 34,275
Employees at year-end | 35,818 | 35,519 | 34,846
Telefónica Hispam | Operating segments |  |  |
Disclosure of operating segments [line items] |  |  |
Average employees over year | 28,191 | 29,715 | 30,232
Employees at year-end | 27,569 | 29,087 | 29,994
Other companies | Operating segments |  |  |
Disclosure of operating segments [line items] |  |  |
Average employees over year | 11,069 | 10,717 | 9,928
Employees at year-end | 11,589 | 10,726 | 10,765

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