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Appendix III: Debentures and Bonds - Maturity (Details)
€ in Millions, £ in Millions, S/ in Millions, R$ in Millions, $ in Millions, $ in Millions, $ in Millions
Dec. 31, 2024
EUR (€)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
GBP (£)
Dec. 31, 2024
CLP ($)
Dec. 31, 2024
PEN (S/)
Dec. 31, 2024
BRL (R$)
Dec. 31, 2024
COP ($)
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds € 30,979            
Less than 1 year              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 3,092            
2026              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 2,134            
2027              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 3,936            
2028              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 2,107            
2029              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 2,352            
Subsequent years              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 17,358            
Spain | Telefónica Europe, B.V. Fund raising in capital markets              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,703            
Spain | Telefónica Europe, B.V. Fund raising in capital markets | T. EUROPE BV SEP_00 BOND GLOBAL D              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   $ 1,203          
Spain | Telefónica Europe, B.V. Fund raising in capital markets | TEBV FEB_03 EMTN FIXED TRANCHE B              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 500            
Spain | Telefónica Europe, B.V. Fund raising in capital markets | Less than 1 year              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Europe, B.V. Fund raising in capital markets | Less than 1 year | T. EUROPE BV SEP_00 BOND GLOBAL D              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Europe, B.V. Fund raising in capital markets | Less than 1 year | TEBV FEB_03 EMTN FIXED TRANCHE B              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Europe, B.V. Fund raising in capital markets | 2026              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Europe, B.V. Fund raising in capital markets | 2026 | T. EUROPE BV SEP_00 BOND GLOBAL D              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Europe, B.V. Fund raising in capital markets | 2026 | TEBV FEB_03 EMTN FIXED TRANCHE B              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Europe, B.V. Fund raising in capital markets | 2027              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Europe, B.V. Fund raising in capital markets | 2027 | T. EUROPE BV SEP_00 BOND GLOBAL D              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Europe, B.V. Fund raising in capital markets | 2027 | TEBV FEB_03 EMTN FIXED TRANCHE B              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Europe, B.V. Fund raising in capital markets | 2028              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Europe, B.V. Fund raising in capital markets | 2028 | T. EUROPE BV SEP_00 BOND GLOBAL D              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Europe, B.V. Fund raising in capital markets | 2028 | TEBV FEB_03 EMTN FIXED TRANCHE B              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Europe, B.V. Fund raising in capital markets | 2029              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Europe, B.V. Fund raising in capital markets | 2029 | T. EUROPE BV SEP_00 BOND GLOBAL D              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Europe, B.V. Fund raising in capital markets | 2029 | TEBV FEB_03 EMTN FIXED TRANCHE B              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Europe, B.V. Fund raising in capital markets | Subsequent years              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,703            
Spain | Telefónica Europe, B.V. Fund raising in capital markets | Subsequent years | T. EUROPE BV SEP_00 BOND GLOBAL D              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   $ 1,203          
Spain | Telefónica Europe, B.V. Fund raising in capital markets | Subsequent years | TEBV FEB_03 EMTN FIXED TRANCHE B              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds € 500            
Spain | Telefónica Europe, B.V. Fund raising in capital markets | Fixed interest rate | T. EUROPE BV SEP_00 BOND GLOBAL D              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 8.25% 8.25% 8.25% 8.25% 8.25% 8.25% 8.25%
Spain | Telefónica Europe, B.V. Fund raising in capital markets | Fixed interest rate | TEBV FEB_03 EMTN FIXED TRANCHE B              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 5.875% 5.875% 5.875% 5.875% 5.875% 5.875% 5.875%
Spain | Telefónica Emisiones, S.A.U.              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds € 26,343            
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES JANUARY 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,127            
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES SEPTEMBER 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | £     £ 892        
Spain | Telefónica Emisiones, S.A.U. | EMTN 02 GBP              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 603            
Spain | Telefónica Emisiones, S.A.U. | TELEF EMISIONES APRIL 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,279            
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES JANUARY 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   $ 1,000          
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES MARCH 2017 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,202            
Spain | Telefónica Emisiones, S.A.U. | TELEF EMISIONES MAY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,250            
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES JANUARY 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 500            
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES SEPTEMBER 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,250            
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES MARCH 2017 2              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 200            
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES MARCH 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | £     1,000        
Spain | Telefónica Emisiones, S.A.U. | EMTN GBP 10/08/2029 400 GBP              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 482            
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES OCTOBER 2014              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 800            
Spain | Telefónica Emisiones, S.A.U. | TELEF EMISIONES FEBRUARY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,000            
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES MAY 2022              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,000            
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES OCTOBER 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 750            
Spain | Telefónica Emisiones, S.A.U. | TELEF EMISIONES MAY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   750          
Spain | Telefónica Emisiones, S.A.U. | TELEF EMISIONES JUNE 06 TRANCHE D              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   1,924          
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES APRIL 2017 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   192          
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES MARCH 2018 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 481            
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES JULY 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 500            
Spain | Telefónica Emisiones, S.A.U. | TELEF EMISIONES JULY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 500            
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES APRIL 2022              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   100          
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES MARCH 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   1,924          
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES APRIL 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   481          
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES MARCH 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   1,203          
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES MARCH 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,203            
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES DECEMBER 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 150            
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES NOVEMBER 2023              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 850            
Spain | Telefónica Emisiones, S.A.U. | Senior sustainable bond of Telefónica Emisiones 2024 (Appendix III)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,000            
Spain | Telefónica Emisiones, S.A.U. | Senior sustainable bond of Telefónica Emisiones 2024 (Appendix III)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 750            
Spain | Telefónica Emisiones, S.A.U. | Less than 1 year              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 2,019            
Spain | Telefónica Emisiones, S.A.U. | Less than 1 year | TELEF. EMISIONES JANUARY 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,127            
Spain | Telefónica Emisiones, S.A.U. | Less than 1 year | TELEF. EMISIONES SEPTEMBER 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | £     892        
Spain | Telefónica Emisiones, S.A.U. | Less than 1 year | EMTN 02 GBP              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Less than 1 year | TELEF EMISIONES APRIL 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Less than 1 year | TELEF. EMISIONES JANUARY 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | Less than 1 year | TELEF. EMISIONES MARCH 2017 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Less than 1 year | TELEF EMISIONES MAY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Less than 1 year | TELEF. EMISIONES JANUARY 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Less than 1 year | TELEF. EMISIONES SEPTEMBER 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Less than 1 year | TELEF. EMISIONES MARCH 2017 2              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Less than 1 year | TELEF. EMISIONES MARCH 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | £     0        
Spain | Telefónica Emisiones, S.A.U. | Less than 1 year | EMTN GBP 10/08/2029 400 GBP              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Less than 1 year | TELEF. EMISIONES OCTOBER 2014              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Less than 1 year | TELEF EMISIONES FEBRUARY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Less than 1 year | TELEF. EMISIONES MAY 2022              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Less than 1 year | TELEF. EMISIONES OCTOBER 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Less than 1 year | TELEF EMISIONES MAY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | Less than 1 year | TELEF EMISIONES JUNE 06 TRANCHE D              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | Less than 1 year | TELEF. EMISIONES APRIL 2017 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | Less than 1 year | TELEF. EMISIONES MARCH 2018 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Less than 1 year | TELEF. EMISIONES JULY 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Less than 1 year | TELEF EMISIONES JULY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Less than 1 year | TELEF. EMISIONES APRIL 2022              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | Less than 1 year | TELEF. EMISIONES MARCH 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | Less than 1 year | TELEF. EMISIONES APRIL 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | Less than 1 year | TELEF. EMISIONES MARCH 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | Less than 1 year | TELEF. EMISIONES MARCH 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Less than 1 year | TELEF. EMISIONES DECEMBER 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Less than 1 year | TELEF. EMISIONES NOVEMBER 2023              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Less than 1 year | Senior sustainable bond of Telefónica Emisiones 2024 (Appendix III)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Less than 1 year | Senior sustainable bond of Telefónica Emisiones 2024 (Appendix III)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,882            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES JANUARY 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES SEPTEMBER 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | £     0        
Spain | Telefónica Emisiones, S.A.U. | 2026 | EMTN 02 GBP              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 603            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF EMISIONES APRIL 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,279            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES JANUARY 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES MARCH 2017 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF EMISIONES MAY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES JANUARY 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES SEPTEMBER 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES MARCH 2017 2              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES MARCH 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | £     0        
Spain | Telefónica Emisiones, S.A.U. | 2026 | EMTN GBP 10/08/2029 400 GBP              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES OCTOBER 2014              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF EMISIONES FEBRUARY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES MAY 2022              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES OCTOBER 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF EMISIONES MAY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF EMISIONES JUNE 06 TRANCHE D              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES APRIL 2017 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES MARCH 2018 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES JULY 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF EMISIONES JULY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES APRIL 2022              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES MARCH 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES APRIL 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES MARCH 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES MARCH 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES DECEMBER 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | TELEF. EMISIONES NOVEMBER 2023              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | Senior sustainable bond of Telefónica Emisiones 2024 (Appendix III)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2026 | Senior sustainable bond of Telefónica Emisiones 2024 (Appendix III)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 3,452            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES JANUARY 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES SEPTEMBER 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | £     0        
Spain | Telefónica Emisiones, S.A.U. | 2027 | EMTN 02 GBP              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF EMISIONES APRIL 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES JANUARY 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   1,000          
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES MARCH 2017 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,202            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF EMISIONES MAY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,250            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES JANUARY 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES SEPTEMBER 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES MARCH 2017 2              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES MARCH 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | £     0        
Spain | Telefónica Emisiones, S.A.U. | 2027 | EMTN GBP 10/08/2029 400 GBP              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES OCTOBER 2014              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF EMISIONES FEBRUARY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES MAY 2022              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES OCTOBER 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF EMISIONES MAY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF EMISIONES JUNE 06 TRANCHE D              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES APRIL 2017 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES MARCH 2018 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES JULY 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF EMISIONES JULY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES APRIL 2022              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES MARCH 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES APRIL 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES MARCH 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES MARCH 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES DECEMBER 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | TELEF. EMISIONES NOVEMBER 2023              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | Senior sustainable bond of Telefónica Emisiones 2024 (Appendix III)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2027 | Senior sustainable bond of Telefónica Emisiones 2024 (Appendix III)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,950            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES JANUARY 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES SEPTEMBER 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | £     0        
Spain | Telefónica Emisiones, S.A.U. | 2028 | EMTN 02 GBP              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF EMISIONES APRIL 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES JANUARY 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES MARCH 2017 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF EMISIONES MAY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES JANUARY 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 500            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES SEPTEMBER 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,250            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES MARCH 2017 2              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 200            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES MARCH 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | £     0        
Spain | Telefónica Emisiones, S.A.U. | 2028 | EMTN GBP 10/08/2029 400 GBP              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES OCTOBER 2014              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF EMISIONES FEBRUARY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES MAY 2022              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES OCTOBER 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF EMISIONES MAY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF EMISIONES JUNE 06 TRANCHE D              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES APRIL 2017 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES MARCH 2018 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES JULY 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF EMISIONES JULY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES APRIL 2022              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES MARCH 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES APRIL 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES MARCH 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES MARCH 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES DECEMBER 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028 | TELEF. EMISIONES NOVEMBER 2023              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028 | Senior sustainable bond of Telefónica Emisiones 2024 (Appendix III)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2028 | Senior sustainable bond of Telefónica Emisiones 2024 (Appendix III)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2029              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 2,282            
Spain | Telefónica Emisiones, S.A.U. | 2029 | TELEF. EMISIONES JANUARY 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2029 | TELEF. EMISIONES SEPTEMBER 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | £     0        
Spain | Telefónica Emisiones, S.A.U. | 2029 | EMTN 02 GBP              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2029 | TELEF EMISIONES APRIL 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2029 | TELEF. EMISIONES JANUARY 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | 2029 | TELEF. EMISIONES MARCH 2017 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2029 | TELEF EMISIONES MAY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2029 | TELEF. EMISIONES JANUARY 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2029 | TELEF. EMISIONES SEPTEMBER 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2029 | TELEF. EMISIONES MARCH 2017 2              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2029 | TELEF. EMISIONES MARCH 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | £     1,000        
Spain | Telefónica Emisiones, S.A.U. | 2029 | EMTN GBP 10/08/2029 400 GBP              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 482            
Spain | Telefónica Emisiones, S.A.U. | 2029 | TELEF. EMISIONES OCTOBER 2014              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 800            
Spain | Telefónica Emisiones, S.A.U. | 2029 | TELEF EMISIONES FEBRUARY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2029 | TELEF. EMISIONES MAY 2022              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2029 | TELEF. EMISIONES OCTOBER 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2029 | TELEF EMISIONES MAY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | 2029 | TELEF EMISIONES JUNE 06 TRANCHE D              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | 2029 | TELEF. EMISIONES APRIL 2017 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | 2029 | TELEF. EMISIONES MARCH 2018 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2029 | TELEF. EMISIONES JULY 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2029 | TELEF EMISIONES JULY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2029 | TELEF. EMISIONES APRIL 2022              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | 2029 | TELEF. EMISIONES MARCH 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | 2029 | TELEF. EMISIONES APRIL 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | 2029 | TELEF. EMISIONES MARCH 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | 2029 | TELEF. EMISIONES MARCH 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2029 | TELEF. EMISIONES DECEMBER 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2029 | TELEF. EMISIONES NOVEMBER 2023              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2029 | Senior sustainable bond of Telefónica Emisiones 2024 (Appendix III)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | 2029 | Senior sustainable bond of Telefónica Emisiones 2024 (Appendix III)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 14,758            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES JANUARY 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES SEPTEMBER 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | £     0        
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | EMTN 02 GBP              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF EMISIONES APRIL 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES JANUARY 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES MARCH 2017 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF EMISIONES MAY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES JANUARY 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES SEPTEMBER 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES MARCH 2017 2              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES MARCH 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | £     £ 0        
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | EMTN GBP 10/08/2029 400 GBP              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES OCTOBER 2014              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF EMISIONES FEBRUARY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,000            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES MAY 2022              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,000            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES OCTOBER 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 750            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF EMISIONES MAY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   750          
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF EMISIONES JUNE 06 TRANCHE D              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   1,924          
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES APRIL 2017 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   192          
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES MARCH 2018 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 481            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES JULY 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 500            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF EMISIONES JULY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 500            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES APRIL 2022              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   100          
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES MARCH 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   1,924          
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES APRIL 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   481          
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES MARCH 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   $ 1,203          
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES MARCH 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,203            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES DECEMBER 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 150            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES NOVEMBER 2023              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 850            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | Senior sustainable bond of Telefónica Emisiones 2024 (Appendix III)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 1,000            
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | Senior sustainable bond of Telefónica Emisiones 2024 (Appendix III)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds € 750            
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES JANUARY 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 1.528% 1.528% 1.528% 1.528% 1.528% 1.528% 1.528%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES SEPTEMBER 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 1.495% 1.495% 1.495% 1.495% 1.495% 1.495% 1.495%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | EMTN 02 GBP              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 5.375% 5.375% 5.375% 5.375% 5.375% 5.375% 5.375%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF EMISIONES APRIL 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 1.46% 1.46% 1.46% 1.46% 1.46% 1.46% 1.46%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES JANUARY 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 1.447% 1.447% 1.447% 1.447% 1.447% 1.447% 1.447%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES MARCH 2017 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 4.103% 4.103% 4.103% 4.103% 4.103% 4.103% 4.103%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF EMISIONES MAY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 1.201% 1.201% 1.201% 1.201% 1.201% 1.201% 1.201%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES JANUARY 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 2.318% 2.318% 2.318% 2.318% 2.318% 2.318% 2.318%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES SEPTEMBER 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 1.715% 1.715% 1.715% 1.715% 1.715% 1.715% 1.715%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES MARCH 2017 2              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 2.318% 2.318% 2.318% 2.318% 2.318% 2.318% 2.318%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES MARCH 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 1.788% 1.788% 1.788% 1.788% 1.788% 1.788% 1.788%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | EMTN GBP 10/08/2029 400 GBP              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 5.445% 5.445% 5.445% 5.445% 5.445% 5.445% 5.445%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES OCTOBER 2014              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 2.932% 2.932% 2.932% 2.932% 2.932% 2.932% 2.932%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF EMISIONES FEBRUARY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 0.664% 0.664% 0.664% 0.664% 0.664% 0.664% 0.664%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES MAY 2022              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 2.592% 2.592% 2.592% 2.592% 2.592% 2.592% 2.592%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES OCTOBER 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 1.93% 1.93% 1.93% 1.93% 1.93% 1.93% 1.93%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF EMISIONES MAY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 1.807% 1.807% 1.807% 1.807% 1.807% 1.807% 1.807%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF EMISIONES JUNE 06 TRANCHE D              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 7.045% 7.045% 7.045% 7.045% 7.045% 7.045% 7.045%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES APRIL 2017 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 4.90% 4.90% 4.90% 4.90% 4.90% 4.90% 4.90%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES MARCH 2018 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 4.665% 4.665% 4.665% 4.665% 4.665% 4.665% 4.665%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES JULY 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 1.957% 1.957% 1.957% 1.957% 1.957% 1.957% 1.957%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF EMISIONES JULY 2020              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 1.864% 1.864% 1.864% 1.864% 1.864% 1.864% 1.864%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES APRIL 2022              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 1.864% 1.864% 1.864% 1.864% 1.864% 1.864% 1.864%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES MARCH 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 5.213% 5.213% 5.213% 5.213% 5.213% 5.213% 5.213%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES APRIL 2017              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 5.213% 5.213% 5.213% 5.213% 5.213% 5.213% 5.213%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES MARCH 2018              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 4.895% 4.895% 4.895% 4.895% 4.895% 4.895% 4.895%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES MARCH 2019              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 5.52% 5.52% 5.52% 5.52% 5.52% 5.52% 5.52%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES DECEMBER 2016              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 4.00% 4.00% 4.00% 4.00% 4.00% 4.00% 4.00%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES NOVEMBER 2023              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 4.183% 4.183% 4.183% 4.183% 4.183% 4.183% 4.183%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | Senior sustainable bond of Telefónica Emisiones 2024 (Appendix III)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 3.698% 3.698% 3.698% 3.698% 3.698% 3.698% 3.698%
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | Senior sustainable bond of Telefónica Emisiones 2024 (Appendix III)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 4.055% 4.055% 4.055% 4.055% 4.055% 4.055% 4.055%
Outside of Parent Country | Telefónica Móviles Chile, S.A.              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds € 693            
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Bond O              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 68            
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Bond Q              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       $ 87      
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Bond 144 A              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       396      
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Bond Serie T In UFC              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   $ 105          
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Bond Serie X In UFC              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   37          
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Less than 1 year              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 68            
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Less than 1 year | Bond O              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 68            
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Less than 1 year | Bond Q              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Less than 1 year | Bond 144 A              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Less than 1 year | Bond Serie T In UFC              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Less than 1 year | Bond Serie X In UFC              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2026              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 87            
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2026 | Bond O              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2026 | Bond Q              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       87      
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2026 | Bond 144 A              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2026 | Bond Serie T In UFC              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2026 | Bond Serie X In UFC              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2027              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2027 | Bond O              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2027 | Bond Q              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2027 | Bond 144 A              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2027 | Bond Serie T In UFC              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2027 | Bond Serie X In UFC              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2028              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 105            
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2028 | Bond O              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2028 | Bond Q              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2028 | Bond 144 A              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2028 | Bond Serie T In UFC              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   105          
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2028 | Bond Serie X In UFC              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2029              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 37            
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2029 | Bond O              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2029 | Bond Q              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2029 | Bond 144 A              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2029 | Bond Serie T In UFC              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2029 | Bond Serie X In UFC              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   37          
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Subsequent years              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 396            
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Subsequent years | Bond O              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds € 0            
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Subsequent years | Bond Q              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       0      
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Subsequent years | Bond 144 A              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $       $ 396      
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Subsequent years | Bond Serie T In UFC              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Subsequent years | Bond Serie X In UFC              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   $ 0          
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Fixed interest rate | Bond O              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 3.50% 3.50% 3.50% 3.50% 3.50% 3.50% 3.50%
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Fixed interest rate | Bond Q              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 3.60% 3.60% 3.60% 3.60% 3.60% 3.60% 3.60%
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Fixed interest rate | Bond 144 A              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 3.537% 3.537% 3.537% 3.537% 3.537% 3.537% 3.537%
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Fixed interest rate | Bond Serie T In UFC              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 4.20% 4.20% 4.20% 4.20% 4.20% 4.20% 4.20%
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Fixed interest rate | Bond Serie X In UFC              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 3.95% 3.95% 3.95% 3.95% 3.95% 3.95% 3.95%
Outside of Parent Country | Telefónica del Perú, S.A.              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         S/ 582    
Outside of Parent Country | Telefónica del Perú, S.A. | Bond T. Peru 4th Program (19th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         28    
Outside of Parent Country | Telefónica del Perú, S.A. | Bond T. Peru 4th Program (19th Serie B)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         22    
Outside of Parent Country | Telefónica del Perú, S.A. | Bond T. Peru 4th Program (37th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         21    
Outside of Parent Country | Telefónica del Perú, S.A. | Bond T. Peru 4th Program (19th Serie C)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         9    
Outside of Parent Country | Telefónica del Perú, S.A. | Bond T. Peru 6th Program (17th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         20    
Outside of Parent Country | Telefónica del Perú, S.A. | Bond T. Peru 6th Program (16th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         27    
Outside of Parent Country | Telefónica del Perú, S.A. | Bond T. Peru 1st Private Program (1st Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         20    
Outside of Parent Country | Telefónica del Perú, S.A. | Bond T. Peru 1st Program International Issue (1sr Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         435    
Outside of Parent Country | Telefónica del Perú, S.A. | Less than 1 year              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         172    
Outside of Parent Country | Telefónica del Perú, S.A. | Less than 1 year | Bond T. Peru 4th Program (19th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | Less than 1 year | Bond T. Peru 4th Program (19th Serie B)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | Less than 1 year | Bond T. Peru 4th Program (37th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | Less than 1 year | Bond T. Peru 4th Program (19th Serie C)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | Less than 1 year | Bond T. Peru 6th Program (17th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | Less than 1 year | Bond T. Peru 6th Program (16th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         27    
Outside of Parent Country | Telefónica del Perú, S.A. | Less than 1 year | Bond T. Peru 1st Private Program (1st Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | Less than 1 year | Bond T. Peru 1st Program International Issue (1sr Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         145    
Outside of Parent Country | Telefónica del Perú, S.A. | 2026              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         165    
Outside of Parent Country | Telefónica del Perú, S.A. | 2026 | Bond T. Peru 4th Program (19th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | 2026 | Bond T. Peru 4th Program (19th Serie B)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | 2026 | Bond T. Peru 4th Program (37th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | 2026 | Bond T. Peru 4th Program (19th Serie C)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | 2026 | Bond T. Peru 6th Program (17th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | 2026 | Bond T. Peru 6th Program (16th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | 2026 | Bond T. Peru 1st Private Program (1st Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         20    
Outside of Parent Country | Telefónica del Perú, S.A. | 2026 | Bond T. Peru 1st Program International Issue (1sr Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         145    
Outside of Parent Country | Telefónica del Perú, S.A. | 2027              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         173    
Outside of Parent Country | Telefónica del Perú, S.A. | 2027 | Bond T. Peru 4th Program (19th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         28    
Outside of Parent Country | Telefónica del Perú, S.A. | 2027 | Bond T. Peru 4th Program (19th Serie B)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | 2027 | Bond T. Peru 4th Program (37th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | 2027 | Bond T. Peru 4th Program (19th Serie C)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | 2027 | Bond T. Peru 6th Program (17th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | 2027 | Bond T. Peru 6th Program (16th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | 2027 | Bond T. Peru 1st Private Program (1st Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | 2027 | Bond T. Peru 1st Program International Issue (1sr Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         145    
Outside of Parent Country | Telefónica del Perú, S.A. | 2028              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         52    
Outside of Parent Country | Telefónica del Perú, S.A. | 2028 | Bond T. Peru 4th Program (19th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | 2028 | Bond T. Peru 4th Program (19th Serie B)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         22    
Outside of Parent Country | Telefónica del Perú, S.A. | 2028 | Bond T. Peru 4th Program (37th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         21    
Outside of Parent Country | Telefónica del Perú, S.A. | 2028 | Bond T. Peru 4th Program (19th Serie C)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         9    
Outside of Parent Country | Telefónica del Perú, S.A. | 2028 | Bond T. Peru 6th Program (17th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | 2028 | Bond T. Peru 6th Program (16th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | 2028 | Bond T. Peru 1st Private Program (1st Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | 2028 | Bond T. Peru 1st Program International Issue (1sr Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | 2029              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | 2029 | Bond T. Peru 4th Program (19th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | 2029 | Bond T. Peru 4th Program (19th Serie B)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | 2029 | Bond T. Peru 4th Program (37th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | 2029 | Bond T. Peru 4th Program (19th Serie C)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | 2029 | Bond T. Peru 6th Program (17th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | 2029 | Bond T. Peru 6th Program (16th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | 2029 | Bond T. Peru 1st Private Program (1st Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | 2029 | Bond T. Peru 1st Program International Issue (1sr Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | Subsequent years              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         20    
Outside of Parent Country | Telefónica del Perú, S.A. | Subsequent years | Bond T. Peru 4th Program (19th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | Subsequent years | Bond T. Peru 4th Program (19th Serie B)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | Subsequent years | Bond T. Peru 4th Program (37th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | Subsequent years | Bond T. Peru 4th Program (19th Serie C)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | Subsequent years | Bond T. Peru 6th Program (17th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         20    
Outside of Parent Country | Telefónica del Perú, S.A. | Subsequent years | Bond T. Peru 6th Program (16th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | Subsequent years | Bond T. Peru 1st Private Program (1st Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         0    
Outside of Parent Country | Telefónica del Perú, S.A. | Subsequent years | Bond T. Peru 1st Program International Issue (1sr Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | S/         S/ 0    
Outside of Parent Country | Telefónica del Perú, S.A. | Fixed interest rate | Bond T. Peru 6th Program (16th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 5.50% 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%
Outside of Parent Country | Telefónica del Perú, S.A. | Fixed interest rate | Bond T. Peru 1st Private Program (1st Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 7.281% 7.281% 7.281% 7.281% 7.281% 7.281% 7.281%
Outside of Parent Country | Telefónica del Perú, S.A. | Fixed interest rate | Bond T. Peru 1st Program International Issue (1sr Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 7.375% 7.375% 7.375% 7.375% 7.375% 7.375% 7.375%
Outside of Parent Country | Telefónica del Perú, S.A. | Floating interest rate | Bond T. Peru 4th Program (19th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 3.625% 3.625% 3.625% 3.625% 3.625% 3.625% 3.625%
Outside of Parent Country | Telefónica del Perú, S.A. | Floating interest rate | Bond T. Peru 4th Program (19th Serie B)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 2.875% 2.875% 2.875% 2.875% 2.875% 2.875% 2.875%
Outside of Parent Country | Telefónica del Perú, S.A. | Floating interest rate | Bond T. Peru 4th Program (37th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 3.125% 3.125% 3.125% 3.125% 3.125% 3.125% 3.125%
Outside of Parent Country | Telefónica del Perú, S.A. | Floating interest rate | Bond T. Peru 4th Program (19th Serie C)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 3.1875% 3.1875% 3.1875% 3.1875% 3.1875% 3.1875% 3.1875%
Outside of Parent Country | Telefónica del Perú, S.A. | Floating interest rate | Bond T. Peru 6th Program (17th Serie A)              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 3.0938% 3.0938% 3.0938% 3.0938% 3.0938% 3.0938% 3.0938%
Outside of Parent Country | Telefônica Brasil, S.A.              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$           R$ 544  
Outside of Parent Country | Telefônica Brasil, S.A. | Debentures 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$           233  
Outside of Parent Country | Telefônica Brasil, S.A. | Debentures 2              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$           311  
Outside of Parent Country | Telefônica Brasil, S.A. | Less than 1 year              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$           233  
Outside of Parent Country | Telefônica Brasil, S.A. | Less than 1 year | Debentures 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$           233  
Outside of Parent Country | Telefônica Brasil, S.A. | Less than 1 year | Debentures 2              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$           0  
Outside of Parent Country | Telefônica Brasil, S.A. | 2026              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$           0  
Outside of Parent Country | Telefônica Brasil, S.A. | 2026 | Debentures 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$           0  
Outside of Parent Country | Telefônica Brasil, S.A. | 2026 | Debentures 2              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$           0  
Outside of Parent Country | Telefônica Brasil, S.A. | 2027              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$           311  
Outside of Parent Country | Telefônica Brasil, S.A. | 2027 | Debentures 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$           0  
Outside of Parent Country | Telefônica Brasil, S.A. | 2027 | Debentures 2              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$           311  
Outside of Parent Country | Telefônica Brasil, S.A. | 2028              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$           0  
Outside of Parent Country | Telefônica Brasil, S.A. | 2028 | Debentures 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$           0  
Outside of Parent Country | Telefônica Brasil, S.A. | 2028 | Debentures 2              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$           0  
Outside of Parent Country | Telefônica Brasil, S.A. | 2029              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$           0  
Outside of Parent Country | Telefônica Brasil, S.A. | 2029 | Debentures 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$           0  
Outside of Parent Country | Telefônica Brasil, S.A. | 2029 | Debentures 2              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$           0  
Outside of Parent Country | Telefônica Brasil, S.A. | Subsequent years              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$           0  
Outside of Parent Country | Telefônica Brasil, S.A. | Subsequent years | Debentures 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$           0  
Outside of Parent Country | Telefônica Brasil, S.A. | Subsequent years | Debentures 2              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | R$           R$ 0  
Outside of Parent Country | Telefônica Brasil, S.A. | Floating interest rate | Debentures 1              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 1.12% 1.12% 1.12% 1.12% 1.12% 1.12% 1.12%
Outside of Parent Country | Telefônica Brasil, S.A. | Floating interest rate | Debentures 2              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 1.35% 1.35% 1.35% 1.35% 1.35% 1.35% 1.35%
Outside of Parent Country | Colombia Telecomunicaciones              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds € 514            
Outside of Parent Country | Colombia Telecomunicaciones | BOND R144-A              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   $ 481          
Outside of Parent Country | Colombia Telecomunicaciones | Bond C10              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $             $ 33
Outside of Parent Country | Colombia Telecomunicaciones | Less than 1 year              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | Colombia Telecomunicaciones | Less than 1 year | BOND R144-A              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Outside of Parent Country | Colombia Telecomunicaciones | Less than 1 year | Bond C10              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $             0
Outside of Parent Country | Colombia Telecomunicaciones | 2026              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | Colombia Telecomunicaciones | 2026 | BOND R144-A              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Outside of Parent Country | Colombia Telecomunicaciones | 2026 | Bond C10              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $             0
Outside of Parent Country | Colombia Telecomunicaciones | 2027              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | Colombia Telecomunicaciones | 2027 | BOND R144-A              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Outside of Parent Country | Colombia Telecomunicaciones | 2027 | Bond C10              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $             0
Outside of Parent Country | Colombia Telecomunicaciones | 2028              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | Colombia Telecomunicaciones | 2028 | BOND R144-A              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Outside of Parent Country | Colombia Telecomunicaciones | 2028 | Bond C10              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $             0
Outside of Parent Country | Colombia Telecomunicaciones | 2029              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 33            
Outside of Parent Country | Colombia Telecomunicaciones | 2029 | BOND R144-A              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   0          
Outside of Parent Country | Colombia Telecomunicaciones | 2029 | Bond C10              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $             33
Outside of Parent Country | Colombia Telecomunicaciones | Subsequent years              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds € 481            
Outside of Parent Country | Colombia Telecomunicaciones | Subsequent years | BOND R144-A              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $   $ 481          
Outside of Parent Country | Colombia Telecomunicaciones | Subsequent years | Bond C10              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds | $             $ 0
Outside of Parent Country | Colombia Telecomunicaciones | Fixed interest rate | BOND R144-A              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 4.95% 4.95% 4.95% 4.95% 4.95% 4.95% 4.95%
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs GmbH Integrated cash management, consulting and financial support for Group companies              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds € 600            
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs GmbH Integrated cash management, consulting and financial support for Group companies | Bond              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 600            
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs GmbH Integrated cash management, consulting and financial support for Group companies | Less than 1 year              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 600            
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs GmbH Integrated cash management, consulting and financial support for Group companies | Less than 1 year | Bond              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 600            
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs GmbH Integrated cash management, consulting and financial support for Group companies | 2026              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs GmbH Integrated cash management, consulting and financial support for Group companies | 2026 | Bond              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs GmbH Integrated cash management, consulting and financial support for Group companies | 2027              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs GmbH Integrated cash management, consulting and financial support for Group companies | 2027 | Bond              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs GmbH Integrated cash management, consulting and financial support for Group companies | 2028              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs GmbH Integrated cash management, consulting and financial support for Group companies | 2028 | Bond              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs GmbH Integrated cash management, consulting and financial support for Group companies | 2029              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs GmbH Integrated cash management, consulting and financial support for Group companies | 2029 | Bond              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs GmbH Integrated cash management, consulting and financial support for Group companies | Subsequent years              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds 0            
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs GmbH Integrated cash management, consulting and financial support for Group companies | Subsequent years | Bond              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Debentures and bonds € 0            
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs GmbH Integrated cash management, consulting and financial support for Group companies | Fixed interest rate | Bond              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 1.75% 1.75% 1.75% 1.75% 1.75% 1.75% 1.75%
Outside of Parent Country | Colombia Telecomunicaciones, S.A., ESP | Floating interest rate | Bond C10              
Disclosure of maturity analysis for non-derivative financial liabilities [line items]              
Interest rate (as a percent) 3.39% 3.39% 3.39% 3.39% 3.39% 3.39% 3.39%