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Appendix VI: Key Regulatory Issues and Concessions and Licenses Held by the Telefonica Group - Schedule of Service Concession Arrangements (Details)
 12 Months Ended
Oct. 19, 2021
Dec. 31, 2024
mhz_frequency
MHz_band
mhz_per_2100mhz_frequency
ghz_frequency
GHz_spectrum_band
region
Disclosure of detailed information about service concession arrangements [line items]    
Possible term extension 20 years  
Frequency range owned by Telefonica (GHz) | GHz_spectrum_band   6
Expiring in 2041 | Spain    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   700
Bandwidth (MHz)   20
Possible term extension   20 years
Expiring in 2041 | Brazil    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   2,300
Expiring in 2041 | Brazil | Minimum    
Disclosure of detailed information about service concession arrangements [line items]    
Bandwidth (MHz)   40
Expiring in 2041 | Brazil | Maximum    
Disclosure of detailed information about service concession arrangements [line items]    
Bandwidth (MHz)   50
Expiring in 2041 | Colombia    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   1,900
Bandwidth (MHz)   15
Possible term extension   20 years
Expiring In 2041, Option 2 | Spain    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   800
Bandwidth (MHz)   20
Possible term extension   10 years
Expiring In 2041, Option 2 | Brazil    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | ghz_frequency   26
Bandwidth (MHz) | GHz_spectrum_band   600
Expiring in 2040 | Spain    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   900
Bandwidth (MHz)   29.6
Possible term extension   10 years
Expiring in 2040 | Germany    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   2,100
Bandwidth (MHz)   10
Expiring in 2040 | Colombia    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   700
Bandwidth (MHz)   20
Expiring in 2038 | Spain    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   1,800
Bandwidth (MHz)   40
Possible term extension   10 years
Expiring in 2038 | Brazil    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   2,100
Expiring in 2038 | Brazil | Minimum    
Disclosure of detailed information about service concession arrangements [line items]    
Bandwidth (MHz)   30
Expiring in 2038 | Brazil | Maximum    
Disclosure of detailed information about service concession arrangements [line items]    
Bandwidth (MHz)   60
Expiring in 2038 | Chile    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   2,600
Bandwidth (MHz)   12
Expiring in 2040, Option 2 | Spain    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   1,900
Bandwidth (MHz)   5
Possible term extension   10 years
Expiring in 2040, Option 2 | Germany    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | ghz_frequency   3.5
Bandwidth (MHz) | GHz_spectrum_band   70
Expiring in 2040, Option 3 | Spain    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   2,100
Bandwidth (MHz)   29.6
Possible term extension   10 years
Expiring in 2040, Option 4 | Spain    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   2,600
Bandwidth (MHz)   40
Possible term extension   10 years
Expiring in 2040, Option 5 | Spain    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   2,600
Bandwidth (MHz)   20
Possible term extension   10 years
Expiring in 2040, Option 6 | Spain    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   2,600
Bandwidth (MHz)   10
Possible term extension   10 years
Amount of regions excluded in national license | region   2
Expiring in 2040, Option 7 | Spain    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | ghz_frequency   3.5
Bandwidth (MHz) | GHz_spectrum_band   40
Possible term extension   10 years
Expiring in 2030 | Peru    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   850
Bandwidth (MHz)   25
Indefinite, Option 1 | United Kingdom    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   700
Bandwidth (MHz)   20
Indefinite, Option 1 | Argentina    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   850
Bandwidth (MHz)   30
Indefinite, Option 1 | Chile    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   850
Bandwidth (MHz)   25
Indefinite, Option 2 | United Kingdom    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   800
Bandwidth (MHz)   20
Indefinite, Option 2 | Argentina    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   850
Bandwidth (MHz)   25
Indefinite, Option 3 | United Kingdom    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   900
Bandwidth (MHz)   34.8
Indefinite, Option 3 | Argentina    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   1,900
Bandwidth (MHz)   20
Indefinite, Option 4 | United Kingdom    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   1,800
Bandwidth (MHz)   11.6
Indefinite, Option 4 | Argentina    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   1,900
Bandwidth (MHz)   50
Indefinite, Option 5 | United Kingdom    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   2,100
Bandwidth (MHz)   20
Indefinite, Option 5 | Argentina    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   1,900
Bandwidth (MHz)   25
Indefinite, Option 6 | United Kingdom    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   2,300
Bandwidth (MHz)   40
Indefinite, Option 7 | United Kingdom    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   2,600
Bandwidth (MHz)   25
Indefinite, Option 8 | United Kingdom    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | ghz_frequency   3.5
Bandwidth (MHz) | GHz_spectrum_band   40
Indefinite, Option 9 | United Kingdom    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | ghz_frequency   3.5
Bandwidth (MHz) | GHz_spectrum_band   40
Expiring in 2033 | Germany    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   700
Bandwidth (MHz)   20
Expiring in 2033 | Argentina    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   700
Bandwidth (MHz)   20
Expiring in 2033 | Peru    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_per_2100mhz_frequency   1,700
Bandwidth (MHz)   40
Expiring in 2033 | Uruguay    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   1,900
Bandwidth (MHz)   40
Expiring in 2025 | Germany    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   800
Bandwidth (MHz)   20
Expiring in 2025 | Colombia    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   850
Bandwidth (MHz)   25
Expiring in 2033, Option 2 | Germany    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   900
Bandwidth (MHz)   20
Expiring in 2033, Option 2 | Argentina    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_per_2100mhz_frequency   1,700
Bandwidth (MHz)   20
Expiring in 2033, Option 3 | Germany    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   1,800
Bandwidth (MHz)   20
Expiring in 2025, Option 1 | Germany    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   1,800
Bandwidth (MHz)   20
Expiring in 2025, Option 1 | Colombia    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_per_2100mhz_frequency   1,700
Bandwidth (MHz)   30
Expiring in 2025, Option 1 | Ecuador    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   850
Bandwidth (MHz)   25
Possible term extension   20 years
Expiring in 2025, Option 2 | Germany    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   1,900
Bandwidth (MHz)   5
Expiring in 2025, Option 2 | Colombia    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   1,900
Bandwidth (MHz)   15
Expiring in 2025, Option 2 | Ecuador    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   1,900
Bandwidth (MHz)   60
Possible term extension   20 years
Expiring in 2025, Option 3 | Germany    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   2,100
Bandwidth (MHz)   14.2
Expiring in 2025, Option 4 | Germany    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   2,100
Bandwidth (MHz)   30
Expiring in 2025, Option 5 | Germany    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   2,600
Bandwidth (MHz)   60
Expiring in 2025, Option 6 | Germany    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   2,600
Bandwidth (MHz)   20
Expiring in 2042/2044 | Uruguay    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   1,900
Bandwidth (MHz)   20
Possible term extension   20 years
Expiring in 2048 | Spain    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | ghz_frequency   3.5
Bandwidth (MHz) | GHz_spectrum_band   10
Possible term extension   10 years
Expiring in 2048 | Uruguay    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | ghz_frequency   3.5
Bandwidth (MHz) | GHz_spectrum_band   100
Expiring in 2048, Option 2 | Spain    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | ghz_frequency   3.5
Bandwidth (MHz) | GHz_spectrum_band   50
Possible term extension   10 years
Expiring in 2043 | Spain    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | ghz_frequency   26
Bandwidth (MHz) | GHz_spectrum_band   1,000
Possible term extension   20 years
Expiring in 2043 | Argentina    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | ghz_frequency   3.5
Bandwidth (MHz) | GHz_spectrum_band   50
Expiring in 2043 | Chile    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   2,600
Bandwidth (MHz)   40
Expiring in 2029 | United Kingdom    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   1,900
Bandwidth (MHz)   5
Expiring in 2029 | Brazil    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   700
Bandwidth (MHz)   20
Expiring in 2029 | Venezuela    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   2,600
Bandwidth (MHz)   40
Expiring in 2027 | Peru    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | ghz_frequency   3.5
Bandwidth (MHz) | GHz_spectrum_band   50
Expiring in 2027 | Venezuela    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   850
Bandwidth (MHz)   25
Possible term extension   5 years
Expiring in 2028 | Brazil    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   850
Bandwidth (MHz)   25
Expiring in 2028 | Peru    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   450
Bandwidth (MHz)   10
Expiring in 2032-2035 | Brazil    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   900
Expiring in 2032-2035 | Brazil | Minimum    
Disclosure of detailed information about service concession arrangements [line items]    
Bandwidth (MHz)   5
Expiring in 2032-2035 | Brazil | Maximum    
Disclosure of detailed information about service concession arrangements [line items]    
Bandwidth (MHz)   10
Expiring in 2032-2035, Option 2 | Brazil    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   1,800
Expiring in 2032-2035, Option 2 | Brazil | Minimum    
Disclosure of detailed information about service concession arrangements [line items]    
Bandwidth (MHz)   20
Expiring in 2032-2035, Option 2 | Brazil | Maximum    
Disclosure of detailed information about service concession arrangements [line items]    
Bandwidth (MHz)   80
Expiring in 2027-2031 | Brazil    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   2,500
Bandwidth (MHz)   40
Expiring In 2041, Option 1 | Brazil    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | ghz_frequency   3.5
Bandwidth (MHz) | GHz_spectrum_band   100
Expiring in 2035 | Argentina    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   2,600
Bandwidth (MHz)   30
Population in service area (as a percent)   65.00%
Expiring in 2045 | Chile    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   700
Bandwidth (MHz)   20
Expiring in 2045 | Uruguay    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   2,600
Bandwidth (MHz)   40
Expiring in 2032 | Chile    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   1,900
Bandwidth (MHz)   20
Expiring in 2051 | Chile    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | ghz_frequency   3.5
Bandwidth (MHz) | GHz_spectrum_band   50
Expiring in 2044 | Colombia    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | ghz_frequency   3.5
Bandwidth (MHz) | GHz_spectrum_band   80
Expiring in 2044 | Uruguay    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   850
Bandwidth (MHz)   25
Possible term extension   20 years
Expiring in 2036 | Peru    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   700
Bandwidth (MHz)   30
Expiring in 2028, Option 2 | Peru    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   900
Bandwidth (MHz)   10
Expiring in 2028, Option 3 | Peru    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   900
Bandwidth (MHz)   16
Expiring in 2030, Option 1 | Peru    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   1,900
Bandwidth (MHz)   25
Expiring in 2018 | Peru    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   1,900
Bandwidth (MHz)   25
Expiring in 2037 | Uruguay    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   700
Bandwidth (MHz)   30
Expiring in 2026 | Venezuela    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | ghz_frequency   3.5
Bandwidth (MHz) | GHz_spectrum_band   50
Expiring in 2027, Option 1 | Venezuela    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_frequency   1,900
Bandwidth (MHz)   50
Possible term extension   5 years
Expiring in 2027, Option 2 | Venezuela    
Disclosure of detailed information about service concession arrangements [line items]    
Frequency | mhz_per_2100mhz_frequency   1,700
Bandwidth (MHz)   20
Possible term extension   5 years