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Segment Information - Composition of Segment Revenues, Detailed by the Main Countries of Operation (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of geographical areas [line items] |  |  |
Revenues | € 41,315 | € 40,652 | € 39,993
Eliminations |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenues | (2,343) | (2,200) | (1,982)
Other and inter-segment eliminations |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenues | 1,382 | 1,353 | 1,261
Others and elims. | Other and inter-segment eliminations |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenues | 1,382 | 1,353 | 1,261
Telefónica Spain |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenues | 12,510 | 12,350 | 12,224
Telefónica Spain | Operating segments |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenues | 12,791 | 12,654 | 12,497
Telefónica Spain | Eliminations |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenues | 281 | 304 | 273
Telefónica Spain | Retailers | Operating segments |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenues | 10,092 | 9,872 | 9,662
Telefónica Spain | Wholesalers, mobile handsets sales and others | Operating segments |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenues | 2,699 | 2,782 | 2,835
Telefónica Germany |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenues | 8,463 | 8,585 | 8,195
Telefónica Germany | Operating segments |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenues | 8,492 | 8,614 | 8,224
Telefónica Germany | Eliminations |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenues | 29 | 29 | 29
Telefónica Germany | Fixed | Operating segments |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenues | 857 | 827 | 806
Telefónica Germany | Mobile | Operating segments |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenues | 7,596 | 7,767 | 7,394
Telefónica Germany | Others and elims. | Operating segments |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenues | 39 | 20 | 24
Telefónica Brazil |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenues | 9,606 | 9,637 | 8,854
Telefónica Brazil | Operating segments |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenues | 9,618 | 9,650 | 8,870
Telefónica Brazil | Eliminations |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenues | 12 | 13 | 16
Telefónica Brazil | Fixed | Operating segments |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenues | 2,772 | 2,858 | 2,764
Telefónica Brazil | Mobile | Operating segments |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenues | 6,846 | 6,792 | 6,106
Telefónica Brazil | Others and elims. | Operating segments |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenues | 0 | 0 | 0
Telefónica Hispam |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenues | 8,918 | 8,284 | 9,026
Telefónica Hispam | Operating segments |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenues | 9,032 | 8,381 | 9,141
Telefónica Hispam | Eliminations |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenues | 114 | 97 | 115
Telefónica Hispam | Fixed | Operating segments |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenues | 2,976 | 2,888 | 3,138
Telefónica Hispam | Mobile | Operating segments |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenues | 6,056 | 5,493 | 6,003
Telefónica Hispam | Others and elims. | Operating segments |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenues | € 0 | € 0 | € 0

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