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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