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Appendix III: Debentures and Bonds - Maturity (Details) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds € 39,581 € 40,055
2018    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 4,664  
2019    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 3,602  
2020    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 5,126  
2021    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 4,826  
2022    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 4,933  
Subsequent years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 16,430  
Spain    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 35,364  
Spain | 2018    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 3,698  
Spain | 2019    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 3,484  
Spain | 2020    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 4,598  
Spain | 2021    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 3,906  
Spain | 2022    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 3,577  
Spain | Subsequent years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 16,101  
Spain | Telefónica Europe, B.V.    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,542  
Spain | Telefónica Europe, B.V. | T. EUROPE BV SEP_00 BOND GLOBAL D    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,042  
Spain | Telefónica Europe, B.V. | 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. | 2018    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Europe, B.V. | 2018 | 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. | 2018 | 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. | 2019    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Europe, B.V. | 2019 | 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. | 2019 | 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. | 2020    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Europe, B.V. | 2020 | 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. | 2020 | 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. | 2021    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Europe, B.V. | 2021 | 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. | 2021 | 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. | 2022    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Europe, B.V. | 2022 | 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. | 2022 | 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. | Subsequent years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,542  
Spain | Telefónica Europe, B.V. | Subsequent years | T. EUROPE BV SEP_00 BOND GLOBAL D    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,042  
Spain | Telefónica Europe, B.V. | 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. | 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%  
Spain | Telefónica Europe, B.V. | 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%  
Spain | Telefónica Emisiones, S.A.U.    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds € 33,222  
Spain | Telefónica Emisiones, S.A.U. | EMTN O2 GBP    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 845  
Spain | Telefónica Emisiones, S.A.U. | EMTN O2 GBP    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 563  
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 1,667  
Spain | Telefónica Emisiones, S.A.U. | TELEF EMISIONES JANUARY 07 A    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 55  
Spain | Telefónica Emisiones, S.A.U. | TELEF EMISIONES JANUARY 07 B    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 24  
Spain | Telefónica Emisiones, S.A.U. | TELEF EMISIONES MAY 2014    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,250  
Spain | Telefónica Emisiones, S.A.U. | TELEF EMISIONES JULY 15, 2019    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 834  
Spain | Telefónica Emisiones, S.A.U. | TELEF EMISIONES NOVEMBER 11, 2019    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,750  
Spain | Telefónica Emisiones, S.A.U. | EMTN GBP 12/09/2022 650 GBP    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 732  
Spain | Telefónica Emisiones, S.A.U. | TELE EMISIONES APRIL 3 2010    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,168  
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 451  
Spain | Telefónica Emisiones, S.A.U. | TELEF EMISIONES FEBRUARY 2011    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,251  
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES FEBRUARY 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,500  
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES FEBRUARY 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 788  
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES JUNE 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 74  
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES OCTOBER 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,200  
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES DECEMBER 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 213  
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES DECEMBER 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 128  
Spain | Telefónica Emisiones, S.A.U. | TELEF EMISIONES JANUARY 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,500  
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES MARCH 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,000  
Spain | Telefónica Emisiones, S.A.U. | TELEF EMISIONES APRIL 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,042  
Spain | Telefónica Emisiones, S.A.U. | TELEF EMISIONES APRIL 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 625  
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES MAY 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 750  
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 OCTOBER 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 192  
Spain | Telefónica Emisiones, S.A.U. | TELEF EMISIONES JULY 2015    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 67  
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES SEPTEMBER 2015    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,000  
Spain | Telefónica Emisiones, S.A.U. | TELEF EMISIONES APRIL 2016    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,400  
Spain | Telefónica Emisiones, S.A.U. | TELEF EMISIONES APRIL 2016    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,350  
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES OCTOBER 2016    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,250  
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 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 JANUARY 2017    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 150  
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES JANUARY 2017    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,250  
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 MARCH 2017    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,251  
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES MARCH 2017    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,668  
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES MARCH 2017    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 200  
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES APRIL 2017    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 167  
Spain | Telefónica Emisiones, S.A.U. | TELEF. EMISIONES APRIL 2017    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 417  
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. | 2018    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 3,698  
Spain | Telefónica Emisiones, S.A.U. | 2018 | EMTN O2 GBP    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 845  
Spain | Telefónica Emisiones, S.A.U. | 2018 | EMTN O2 GBP    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2018 | 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. | 2018 | TELEF EMISIONES JANUARY 07 A    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2018 | TELEF EMISIONES JANUARY 07 B    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 24  
Spain | Telefónica Emisiones, S.A.U. | 2018 | TELEF EMISIONES MAY 2014    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2018 | TELEF EMISIONES JULY 15, 2019    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2018 | TELEF EMISIONES NOVEMBER 11, 2019    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2018 | EMTN GBP 12/09/2022 650 GBP    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2018 | TELE EMISIONES APRIL 3 2010    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2018 | 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. | 2018 | TELEF EMISIONES FEBRUARY 2011    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2018 | TELEF. EMISIONES FEBRUARY 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,500  
Spain | Telefónica Emisiones, S.A.U. | 2018 | TELEF. EMISIONES FEBRUARY 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2018 | TELEF. EMISIONES JUNE 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 74  
Spain | Telefónica Emisiones, S.A.U. | 2018 | TELEF. EMISIONES OCTOBER 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2018 | TELEF. EMISIONES DECEMBER 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 213  
Spain | Telefónica Emisiones, S.A.U. | 2018 | TELEF. EMISIONES DECEMBER 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2018 | TELEF EMISIONES JANUARY 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2018 | TELEF. EMISIONES MARCH 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2018 | TELEF EMISIONES APRIL 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,042  
Spain | Telefónica Emisiones, S.A.U. | 2018 | TELEF EMISIONES APRIL 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2018 | TELEF. EMISIONES MAY 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2018 | 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. | 2018 | TELEF. EMISIONES OCTOBER 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2018 | TELEF EMISIONES JULY 2015    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2018 | TELEF. EMISIONES SEPTEMBER 2015    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2018 | 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. | 2018 | 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. | 2018 | 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. | 2018 | 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. | 2018 | 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. | 2018 | 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. | 2018 | 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. | 2018 | 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. | 2018 | 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. | 2018 | 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. | 2018 | 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. | 2018 | 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. | 2018 | 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. | 2018 | 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. | 2019    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 3,484  
Spain | Telefónica Emisiones, S.A.U. | 2019 | EMTN O2 GBP    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2019 | EMTN O2 GBP    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2019 | 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. | 2019 | TELEF EMISIONES JANUARY 07 A    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2019 | TELEF EMISIONES JANUARY 07 B    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2019 | TELEF EMISIONES MAY 2014    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2019 | TELEF EMISIONES JULY 15, 2019    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 834  
Spain | Telefónica Emisiones, S.A.U. | 2019 | TELEF EMISIONES NOVEMBER 11, 2019    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,750  
Spain | Telefónica Emisiones, S.A.U. | 2019 | EMTN GBP 12/09/2022 650 GBP    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2019 | TELE EMISIONES APRIL 3 2010    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2019 | 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. | 2019 | TELEF EMISIONES FEBRUARY 2011    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2019 | TELEF. EMISIONES FEBRUARY 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2019 | TELEF. EMISIONES FEBRUARY 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2019 | TELEF. EMISIONES JUNE 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2019 | TELEF. EMISIONES OCTOBER 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2019 | TELEF. EMISIONES DECEMBER 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2019 | TELEF. EMISIONES DECEMBER 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2019 | TELEF EMISIONES JANUARY 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2019 | TELEF. EMISIONES MARCH 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2019 | TELEF EMISIONES APRIL 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2019 | TELEF EMISIONES APRIL 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2019 | TELEF. EMISIONES MAY 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 750  
Spain | Telefónica Emisiones, S.A.U. | 2019 | 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. | 2019 | TELEF. EMISIONES OCTOBER 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2019 | TELEF EMISIONES JULY 2015    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2019 | TELEF. EMISIONES SEPTEMBER 2015    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2019 | 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. | 2019 | 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. | 2019 | 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. | 2019 | 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. | 2019 | 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. | 2019 | TELEF. EMISIONES JANUARY 2017    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 150  
Spain | Telefónica Emisiones, S.A.U. | 2019 | 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. | 2019 | 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. | 2019 | 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. | 2019 | 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. | 2019 | 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. | 2019 | 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. | 2019 | 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. | 2019 | 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. | 2020    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 4,598  
Spain | Telefónica Emisiones, S.A.U. | 2020 | EMTN O2 GBP    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2020 | EMTN O2 GBP    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2020 | 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. | 2020 | TELEF EMISIONES JANUARY 07 A    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2020 | TELEF EMISIONES JANUARY 07 B    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2020 | TELEF EMISIONES MAY 2014    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2020 | TELEF EMISIONES JULY 15, 2019    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2020 | TELEF EMISIONES NOVEMBER 11, 2019    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2020 | EMTN GBP 12/09/2022 650 GBP    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2020 | TELE EMISIONES APRIL 3 2010    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,168  
Spain | Telefónica Emisiones, S.A.U. | 2020 | 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. | 2020 | TELEF EMISIONES FEBRUARY 2011    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2020 | TELEF. EMISIONES FEBRUARY 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2020 | TELEF. EMISIONES FEBRUARY 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 788  
Spain | Telefónica Emisiones, S.A.U. | 2020 | TELEF. EMISIONES JUNE 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2020 | TELEF. EMISIONES OCTOBER 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,200  
Spain | Telefónica Emisiones, S.A.U. | 2020 | TELEF. EMISIONES DECEMBER 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2020 | TELEF. EMISIONES DECEMBER 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2020 | TELEF EMISIONES JANUARY 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2020 | TELEF. EMISIONES MARCH 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2020 | TELEF EMISIONES APRIL 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2020 | TELEF EMISIONES APRIL 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2020 | TELEF. EMISIONES MAY 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2020 | 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. | 2020 | TELEF. EMISIONES OCTOBER 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 192  
Spain | Telefónica Emisiones, S.A.U. | 2020 | TELEF EMISIONES JULY 2015    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2020 | TELEF. EMISIONES SEPTEMBER 2015    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2020 | 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. | 2020 | 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. | 2020 | TELEF. EMISIONES OCTOBER 2016    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,250  
Spain | Telefónica Emisiones, S.A.U. | 2020 | 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. | 2020 | 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. | 2020 | 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. | 2020 | 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. | 2020 | 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. | 2020 | 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. | 2020 | 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. | 2020 | 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. | 2020 | 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. | 2020 | 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. | 2020 | 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. | 2021    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 3,306  
Spain | Telefónica Emisiones, S.A.U. | 2021 | EMTN O2 GBP    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2021 | EMTN O2 GBP    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2021 | 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. | 2021 | TELEF EMISIONES JANUARY 07 A    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 55  
Spain | Telefónica Emisiones, S.A.U. | 2021 | TELEF EMISIONES JANUARY 07 B    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2021 | TELEF EMISIONES MAY 2014    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2021 | TELEF EMISIONES JULY 15, 2019    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2021 | TELEF EMISIONES NOVEMBER 11, 2019    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2021 | EMTN GBP 12/09/2022 650 GBP    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2021 | TELE EMISIONES APRIL 3 2010    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2021 | 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. | 2021 | TELEF EMISIONES FEBRUARY 2011    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,251  
Spain | Telefónica Emisiones, S.A.U. | 2021 | TELEF. EMISIONES FEBRUARY 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2021 | TELEF. EMISIONES FEBRUARY 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2021 | TELEF. EMISIONES JUNE 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2021 | TELEF. EMISIONES OCTOBER 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2021 | TELEF. EMISIONES DECEMBER 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2021 | TELEF. EMISIONES DECEMBER 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2021 | TELEF EMISIONES JANUARY 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2021 | TELEF. EMISIONES MARCH 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,000  
Spain | Telefónica Emisiones, S.A.U. | 2021 | TELEF EMISIONES APRIL 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2021 | TELEF EMISIONES APRIL 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2021 | TELEF. EMISIONES MAY 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2021 | 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. | 2021 | TELEF. EMISIONES OCTOBER 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2021 | TELEF EMISIONES JULY 2015    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2021 | TELEF. EMISIONES SEPTEMBER 2015    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,000  
Spain | Telefónica Emisiones, S.A.U. | 2021 | 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. | 2021 | 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. | 2021 | 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. | 2021 | 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. | 2021 | 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. | 2021 | 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. | 2021 | 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. | 2021 | 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. | 2021 | 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. | 2021 | 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. | 2021 | 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. | 2021 | 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. | 2021 | 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. | 2021 | 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. | 2022    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 3,577  
Spain | Telefónica Emisiones, S.A.U. | 2022 | EMTN O2 GBP    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2022 | EMTN O2 GBP    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2022 | 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. | 2022 | TELEF EMISIONES JANUARY 07 A    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2022 | TELEF EMISIONES JANUARY 07 B    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2022 | TELEF EMISIONES MAY 2014    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,250  
Spain | Telefónica Emisiones, S.A.U. | 2022 | TELEF EMISIONES JULY 15, 2019    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2022 | TELEF EMISIONES NOVEMBER 11, 2019    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2022 | EMTN GBP 12/09/2022 650 GBP    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 732  
Spain | Telefónica Emisiones, S.A.U. | 2022 | TELE EMISIONES APRIL 3 2010    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2022 | 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. | 2022 | TELEF EMISIONES FEBRUARY 2011    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2022 | TELEF. EMISIONES FEBRUARY 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2022 | TELEF. EMISIONES FEBRUARY 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2022 | TELEF. EMISIONES JUNE 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2022 | TELEF. EMISIONES OCTOBER 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2022 | TELEF. EMISIONES DECEMBER 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2022 | TELEF. EMISIONES DECEMBER 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 128  
Spain | Telefónica Emisiones, S.A.U. | 2022 | TELEF EMISIONES JANUARY 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2022 | TELEF. EMISIONES MARCH 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2022 | TELEF EMISIONES APRIL 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2022 | TELEF EMISIONES APRIL 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2022 | TELEF. EMISIONES MAY 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2022 | 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. | 2022 | TELEF. EMISIONES OCTOBER 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2022 | TELEF EMISIONES JULY 2015    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 67  
Spain | Telefónica Emisiones, S.A.U. | 2022 | TELEF. EMISIONES SEPTEMBER 2015    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | 2022 | TELEF EMISIONES APRIL 2016    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,400  
Spain | Telefónica Emisiones, S.A.U. | 2022 | 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. | 2022 | 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. | 2022 | 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. | 2022 | 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. | 2022 | 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. | 2022 | 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. | 2022 | 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. | 2022 | 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. | 2022 | 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. | 2022 | 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. | 2022 | 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. | 2022 | 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. | 2022 | 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    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 14,559  
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | EMTN O2 GBP    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | EMTN O2 GBP    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 563  
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 1,667  
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF EMISIONES JANUARY 07 A    
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 07 B    
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 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 JULY 15, 2019    
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 NOVEMBER 11, 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 12/09/2022 650 GBP    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELE EMISIONES APRIL 3 2010    
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 451  
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF EMISIONES FEBRUARY 2011    
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 2012    
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 2012    
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 JUNE 2013    
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 2012    
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 DECEMBER 2012    
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 DECEMBER 2012    
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 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,500  
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES MARCH 2013    
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 2013    
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 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 625  
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES MAY 2013    
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 800  
Spain | Telefónica Emisiones, S.A.U. | Subsequent years | TELEF. EMISIONES OCTOBER 2013    
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 JULY 2015    
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 2015    
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 APRIL 2016    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,350  
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 0  
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 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 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 JANUARY 2017    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,250  
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 500  
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 1,251  
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 1,668  
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 200  
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 167  
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 417  
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 € 1,250  
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | EMTN O2 GBP    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 5.375%  
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | EMTN O2 GBP    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 5.375%  
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%  
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF EMISIONES MAY 2014    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 2.242%  
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF EMISIONES JULY 15, 2019    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 5.877%  
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF EMISIONES NOVEMBER 11, 2019    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 4.693%  
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | EMTN GBP 12/09/2022 650 GBP    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 5.289%  
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELE EMISIONES APRIL 3 2010    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 5.134%  
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%  
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF EMISIONES FEBRUARY 2011    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 5.462%  
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES FEBRUARY 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 4.797%  
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES FEBRUARY 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 5.597%  
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES JUNE 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 4.25%  
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES OCTOBER 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 4.71%  
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES DECEMBER 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 2.718%  
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES DECEMBER 2012    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 3.45%  
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF EMISIONES JANUARY 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 3.987%  
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES MARCH 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 3.961%  
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF EMISIONES APRIL 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 3.192%  
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF EMISIONES APRIL 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 4.57%  
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES MAY 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 2.736%  
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%  
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES OCTOBER 2013    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 2.595%  
Spain | Telefónica Emisiones, S.A.U. | Fixed interest rate | TELEF. EMISIONES SEPTEMBER 2015    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 1.477%  
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) 0.75%  
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%  
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) 0.318%  
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%  
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%  
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%  
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%  
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) 4.103%  
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%  
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) 2.318%  
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) 4.90%  
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%  
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%  
Spain | Telefónica Emisiones, S.A.U. | Floating interest rate | TELEF EMISIONES JANUARY 07 A    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 0.83%  
Spain | Telefónica Emisiones, S.A.U. | Floating interest rate | TELEF EMISIONES JANUARY 07 B    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 0.70%  
Spain | Telefónica Emisiones, S.A.U. | Floating interest rate | TELEF EMISIONES JULY 2015    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 0.83%  
Spain | Telefónica Emisiones, S.A.U. | Floating interest rate | TELEF. EMISIONES JANUARY 2017    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 0.40%  
Spain | Telefónica Participaciones    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds € 600  
Spain | Telefónica Participaciones | Exchangeable Bond MARCH 2016 ()    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 600  
Spain | Telefónica Participaciones | 2018    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Participaciones | 2018 | Exchangeable Bond MARCH 2016 ()    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Participaciones | 2019    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Participaciones | 2019 | Exchangeable Bond MARCH 2016 ()    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Participaciones | 2020    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Participaciones | 2020 | Exchangeable Bond MARCH 2016 ()    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Participaciones | 2021    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 600  
Spain | Telefónica Participaciones | 2021 | Exchangeable Bond MARCH 2016 ()    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 600  
Spain | Telefónica Participaciones | 2022    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Participaciones | 2022 | Exchangeable Bond MARCH 2016 ()    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Participaciones | Subsequent years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Spain | Telefónica Participaciones | Subsequent years | Exchangeable Bond MARCH 2016 ()    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds € 0  
Spain | Telefónica Participaciones | Fixed interest rate | Exchangeable Bond MARCH 2016 ()    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 0.00%  
Outside of Parent Country    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds € 4,217  
Outside of Parent Country | 2018    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 966  
Outside of Parent Country | 2019    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 118  
Outside of Parent Country | 2020    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 528  
Outside of Parent Country | 2021    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 920  
Outside of Parent Country | 2022    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1,356  
Outside of Parent Country | Subsequent years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 329  
Outside of Parent Country | Telefónica Chile, S.A.    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 546  
Outside of Parent Country | Telefónica Chile, S.A. | Bond Q    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 64  
Outside of Parent Country | Telefónica Chile, S.A. | Bond T    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 65  
Outside of Parent Country | Telefónica Chile, S.A. | 144A Bond    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 417  
Outside of Parent Country | Telefónica Chile, S.A. | 2018    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Chile, S.A. | 2018 | Bond Q    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Chile, S.A. | 2018 | Bond T    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Chile, S.A. | 2018 | 144A Bond    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Chile, S.A. | 2019    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 64  
Outside of Parent Country | Telefónica Chile, S.A. | 2019 | Bond Q    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 64  
Outside of Parent Country | Telefónica Chile, S.A. | 2019 | Bond T    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Chile, S.A. | 2019 | 144A Bond    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Chile, S.A. | 2020    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 13  
Outside of Parent Country | Telefónica Chile, S.A. | 2020 | Bond Q    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Chile, S.A. | 2020 | Bond T    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 13  
Outside of Parent Country | Telefónica Chile, S.A. | 2020 | 144A Bond    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Chile, S.A. | 2021    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 26  
Outside of Parent Country | Telefónica Chile, S.A. | 2021 | Bond Q    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Chile, S.A. | 2021 | Bond T    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 26  
Outside of Parent Country | Telefónica Chile, S.A. | 2021 | 144A Bond    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Chile, S.A. | 2022    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 417  
Outside of Parent Country | Telefónica Chile, S.A. | 2022 | Bond Q    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Chile, S.A. | 2022 | Bond T    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Chile, S.A. | 2022 | 144A Bond    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 417  
Outside of Parent Country | Telefónica Chile, S.A. | Subsequent years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 26  
Outside of Parent Country | Telefónica 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 Chile, S.A. | Subsequent years | Bond T    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 26  
Outside of Parent Country | Telefónica Chile, S.A. | Subsequent years | 144A Bond    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds € 0  
Outside of Parent Country | Telefónica Chile, S.A. | Fixed interest rate | Bond Q    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 5.75%  
Outside of Parent Country | Telefónica Chile, S.A. | Fixed interest rate | Bond T    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 4.90%  
Outside of Parent Country | Telefónica Chile, S.A. | Fixed interest rate | 144A Bond    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 3.875%  
Outside of Parent Country | Telefónica Móviles Chile, S.A.    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds € 383  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Bond F    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 109  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Bond G    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 73  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Bond I    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 73  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Bond K    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 128  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2018    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2018 | Bond F    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2018 | Bond G    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2018 | Bond I    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2018 | Bond K    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2019    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2019 | Bond F    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2019 | Bond G    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2019 | Bond I    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2019 | Bond K    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2020    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 146  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2020 | Bond F    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2020 | Bond G    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 73  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2020 | Bond I    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 73  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2020 | Bond K    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2021    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 128  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2021 | Bond F    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2021 | Bond G    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2021 | Bond I    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2021 | Bond K    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 128  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2022    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2022 | Bond F    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2022 | Bond G    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2022 | Bond I    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | 2022 | Bond K    
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    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 109  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Subsequent years | Bond F    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 109  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Subsequent years | Bond G    
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 I    
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 K    
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 F    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 3.60%  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Fixed interest rate | Bond G    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 2.20%  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Fixed interest rate | Bond I    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 1.95%  
Outside of Parent Country | Telefónica Móviles Chile, S.A. | Fixed interest rate | Bond K    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 4.90%  
Outside of Parent Country | Telefónica Finanzas México, S.A.    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds € 83  
Outside of Parent Country | Telefónica Finanzas México, S.A. | T. Finanzas Mex 0710 FIX    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 83  
Outside of Parent Country | Telefónica Finanzas México, S.A. | 2018    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Finanzas México, S.A. | 2018 | T. Finanzas Mex 0710 FIX    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Finanzas México, S.A. | 2019    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Finanzas México, S.A. | 2019 | T. Finanzas Mex 0710 FIX    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Finanzas México, S.A. | 2020    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 83  
Outside of Parent Country | Telefónica Finanzas México, S.A. | 2020 | T. Finanzas Mex 0710 FIX    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 83  
Outside of Parent Country | Telefónica Finanzas México, S.A. | 2021    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Finanzas México, S.A. | 2021 | T. Finanzas Mex 0710 FIX    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Finanzas México, S.A. | 2022    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Finanzas México, S.A. | 2022 | T. Finanzas Mex 0710 FIX    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Finanzas México, S.A. | Subsequent years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica Finanzas México, S.A. | Subsequent years | T. Finanzas Mex 0710 FIX    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds € 0  
Outside of Parent Country | Telefónica Finanzas México, S.A. | Fixed interest rate | T. Finanzas Mex 0710 FIX    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 8.07%  
Outside of Parent Country | Telefónica del Perú, S.A.    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds € 362  
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 22  
Outside of Parent Country | Telefónica del Perú, S.A. | Bond T. Peru 4th Program (12th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 21  
Outside of Parent Country | Telefónica del Perú, S.A. | Bond T. Peru 4th Program (36th Serie B)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 17  
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 17  
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 16  
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 7  
Outside of Parent Country | Telefónica del Perú, S.A. | Bond T. Peru 5th Program (22nd Serie Ab)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 4  
Outside of Parent Country | Telefónica del Perú, S.A. | Bond T. Peru 5th Program (22nd Serie Ac)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 8  
Outside of Parent Country | Telefónica del Perú, S.A. | Bond T. Peru 6th Program (11th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 67  
Outside of Parent Country | Telefónica del Perú, S.A. | Bond T. Peru 6th Program (11th Serie B)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 31  
Outside of Parent Country | Telefónica del Perú, S.A. | Bond T. Peru 6th Program (12th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 28  
Outside of Parent Country | Telefónica del Perú, S.A. | Bond T. Peru 6th Program (13th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 36  
Outside of Parent Country | Telefónica del Perú, S.A. | Bond T. Peru 6th Program (14th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 26  
Outside of Parent Country | Telefónica del Perú, S.A. | Bond T. Peru 6th Program (15th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 34  
Outside of Parent Country | Telefónica del Perú, S.A. | Bond TM Peru 2nd Program (11th Serie B)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 15  
Outside of Parent Country | Telefónica del Perú, S.A. | Bond TM Peru 2nd Program (27th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 13  
Outside of Parent Country | Telefónica del Perú, S.A. | 2018    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 32  
Outside of Parent Country | Telefónica del Perú, S.A. | 2018 | Bond T. Peru 4th Program (19th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2018 | Bond T. Peru 4th Program (12th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2018 | Bond T. Peru 4th Program (36th Serie B)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 17  
Outside of Parent Country | Telefónica del Perú, S.A. | 2018 | Bond T. Peru 4th Program (19th Serie B)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2018 | Bond T. Peru 4th Program (37th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2018 | Bond T. Peru 4th Program (19th Serie C)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2018 | Bond T. Peru 5th Program (22nd Serie Ab)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2018 | Bond T. Peru 5th Program (22nd Serie Ac)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2018 | Bond T. Peru 6th Program (11th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2018 | Bond T. Peru 6th Program (11th Serie B)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2018 | Bond T. Peru 6th Program (12th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2018 | Bond T. Peru 6th Program (13th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2018 | Bond T. Peru 6th Program (14th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2018 | Bond T. Peru 6th Program (15th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2018 | Bond TM Peru 2nd Program (11th Serie B)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 15  
Outside of Parent Country | Telefónica del Perú, S.A. | 2018 | Bond TM Peru 2nd Program (27th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2019    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 38  
Outside of Parent Country | Telefónica del Perú, S.A. | 2019 | Bond T. Peru 4th Program (19th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2019 | Bond T. Peru 4th Program (12th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 21  
Outside of Parent Country | Telefónica del Perú, S.A. | 2019 | Bond T. Peru 4th Program (36th Serie B)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2019 | Bond T. Peru 4th Program (19th Serie B)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2019 | Bond T. Peru 4th Program (37th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2019 | Bond T. Peru 4th Program (19th Serie C)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2019 | Bond T. Peru 5th Program (22nd Serie Ab)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 4  
Outside of Parent Country | Telefónica del Perú, S.A. | 2019 | Bond T. Peru 5th Program (22nd Serie Ac)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2019 | Bond T. Peru 6th Program (11th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2019 | Bond T. Peru 6th Program (11th Serie B)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2019 | Bond T. Peru 6th Program (12th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2019 | Bond T. Peru 6th Program (13th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2019 | Bond T. Peru 6th Program (14th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2019 | Bond T. Peru 6th Program (15th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2019 | Bond TM Peru 2nd Program (11th Serie B)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2019 | Bond TM Peru 2nd Program (27th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 13  
Outside of Parent Country | Telefónica del Perú, S.A. | 2020    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 28  
Outside of Parent Country | Telefónica del Perú, S.A. | 2020 | Bond T. Peru 4th Program (19th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2020 | Bond T. Peru 4th Program (12th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2020 | Bond T. Peru 4th Program (36th Serie B)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2020 | Bond T. Peru 4th Program (19th Serie B)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2020 | Bond T. Peru 4th Program (37th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2020 | Bond T. Peru 4th Program (19th Serie C)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2020 | Bond T. Peru 5th Program (22nd Serie Ab)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2020 | Bond T. Peru 5th Program (22nd Serie Ac)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2020 | Bond T. Peru 6th Program (11th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2020 | Bond T. Peru 6th Program (11th Serie B)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2020 | Bond T. Peru 6th Program (12th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 28  
Outside of Parent Country | Telefónica del Perú, S.A. | 2020 | Bond T. Peru 6th Program (13th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2020 | Bond T. Peru 6th Program (14th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2020 | Bond T. Peru 6th Program (15th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2020 | Bond TM Peru 2nd Program (11th Serie B)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2020 | Bond TM Peru 2nd Program (27th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2021    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 8  
Outside of Parent Country | Telefónica del Perú, S.A. | 2021 | Bond T. Peru 4th Program (19th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2021 | Bond T. Peru 4th Program (12th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2021 | Bond T. Peru 4th Program (36th Serie B)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2021 | Bond T. Peru 4th Program (19th Serie B)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2021 | Bond T. Peru 4th Program (37th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2021 | Bond T. Peru 4th Program (19th Serie C)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2021 | Bond T. Peru 5th Program (22nd Serie Ab)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2021 | Bond T. Peru 5th Program (22nd Serie Ac)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 8  
Outside of Parent Country | Telefónica del Perú, S.A. | 2021 | Bond T. Peru 6th Program (11th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2021 | Bond T. Peru 6th Program (11th Serie B)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2021 | Bond T. Peru 6th Program (12th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2021 | Bond T. Peru 6th Program (13th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2021 | Bond T. Peru 6th Program (14th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2021 | Bond T. Peru 6th Program (15th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2021 | Bond TM Peru 2nd Program (11th Serie B)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2021 | Bond TM Peru 2nd Program (27th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2022    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 62  
Outside of Parent Country | Telefónica del Perú, S.A. | 2022 | Bond T. Peru 4th Program (19th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2022 | Bond T. Peru 4th Program (12th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2022 | Bond T. Peru 4th Program (36th Serie B)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2022 | Bond T. Peru 4th Program (19th Serie B)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2022 | Bond T. Peru 4th Program (37th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2022 | Bond T. Peru 4th Program (19th Serie C)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2022 | Bond T. Peru 5th Program (22nd Serie Ab)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2022 | Bond T. Peru 5th Program (22nd Serie Ac)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2022 | Bond T. Peru 6th Program (11th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2022 | Bond T. Peru 6th Program (11th Serie B)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2022 | Bond T. Peru 6th Program (12th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2022 | Bond T. Peru 6th Program (13th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 36  
Outside of Parent Country | Telefónica del Perú, S.A. | 2022 | Bond T. Peru 6th Program (14th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 26  
Outside of Parent Country | Telefónica del Perú, S.A. | 2022 | Bond T. Peru 6th Program (15th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2022 | Bond TM Peru 2nd Program (11th Serie B)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | 2022 | Bond TM Peru 2nd Program (27th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 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 194  
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 22  
Outside of Parent Country | Telefónica del Perú, S.A. | Subsequent years | Bond T. Peru 4th Program (12th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | Subsequent years | Bond T. Peru 4th Program (36th Serie B)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 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 17  
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 16  
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 7  
Outside of Parent Country | Telefónica del Perú, S.A. | Subsequent years | Bond T. Peru 5th Program (22nd Serie Ab)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | Subsequent years | Bond T. Peru 5th Program (22nd Serie Ac)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | Subsequent years | Bond T. Peru 6th Program (11th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 67  
Outside of Parent Country | Telefónica del Perú, S.A. | Subsequent years | Bond T. Peru 6th Program (11th Serie B)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 31  
Outside of Parent Country | Telefónica del Perú, S.A. | Subsequent years | Bond T. Peru 6th Program (12th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | Subsequent years | Bond T. Peru 6th Program (13th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | Subsequent years | Bond T. Peru 6th Program (14th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | Subsequent years | Bond T. Peru 6th Program (15th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 34  
Outside of Parent Country | Telefónica del Perú, S.A. | Subsequent years | Bond TM Peru 2nd Program (11th Serie B)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefónica del Perú, S.A. | Subsequent years | Bond TM Peru 2nd Program (27th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds € 0  
Outside of Parent Country | Telefónica del Perú, S.A. | Fixed interest rate | Bond T. Peru 6th Program (11th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 6.65625%  
Outside of Parent Country | Telefónica del Perú, S.A. | Fixed interest rate | Bond T. Peru 6th Program (11th Serie B)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 6.19%  
Outside of Parent Country | Telefónica del Perú, S.A. | Fixed interest rate | Bond T. Peru 6th Program (12th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 5.06%  
Outside of Parent Country | Telefónica del Perú, S.A. | Fixed interest rate | Bond T. Peru 6th Program (13th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 5.50%  
Outside of Parent Country | Telefónica del Perú, S.A. | Fixed interest rate | Bond T. Peru 6th Program (14th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 5.34%  
Outside of Parent Country | Telefónica del Perú, S.A. | Fixed interest rate | Bond T. Peru 6th Program (15th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 5.47%  
Outside of Parent Country | Telefónica del Perú, S.A. | Fixed interest rate | Bond TM Peru 2nd Program (11th Serie B)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 7.375%  
Outside of Parent Country | Telefónica del Perú, S.A. | Fixed interest rate | Bond TM Peru 2nd Program (27th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 5.53125%  
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%  
Outside of Parent Country | Telefónica del Perú, S.A. | Floating interest rate | Bond T. Peru 4th Program (12th Serie A)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 3.6875%  
Outside of Parent Country | Telefónica del Perú, S.A. | Floating interest rate | Bond T. Peru 4th Program (36th Serie B)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 3.375%  
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%  
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%  
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%  
Outside of Parent Country | Telefónica del Perú, S.A. | Floating interest rate | Bond T. Peru 5th Program (22nd Serie Ab)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 3.50%  
Outside of Parent Country | Telefónica del Perú, S.A. | Floating interest rate | Bond T. Peru 5th Program (22nd Serie Ac)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 3.50%  
Outside of Parent Country | Telefônica Brasil, S.A.    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds € 1,118  
Outside of Parent Country | Telefônica Brasil, S.A. | Nonconvertible bonds    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 328  
Outside of Parent Country | Telefônica Brasil, S.A. | Nonconvertible bonds    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 504  
Outside of Parent Country | Telefônica Brasil, S.A. | Nonconvertible bonds    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 252  
Outside of Parent Country | Telefônica Brasil, S.A. | Nonconvertible bonds    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 10  
Outside of Parent Country | Telefônica Brasil, S.A. | Nonconvertible bonds ( Telemig) I    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 4  
Outside of Parent Country | Telefônica Brasil, S.A. | Nonconvertible bonds ( Telemig) II    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 8  
Outside of Parent Country | Telefônica Brasil, S.A. | Nonconvertible bonds ( Telemig) III    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 12  
Outside of Parent Country | Telefônica Brasil, S.A. | 2018    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 334  
Outside of Parent Country | Telefônica Brasil, S.A. | 2018 | Nonconvertible bonds    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 328  
Outside of Parent Country | Telefônica Brasil, S.A. | 2018 | Nonconvertible bonds    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefônica Brasil, S.A. | 2018 | Nonconvertible bonds    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefônica Brasil, S.A. | 2018 | Nonconvertible bonds    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefônica Brasil, S.A. | 2018 | Nonconvertible bonds ( Telemig) I    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1  
Outside of Parent Country | Telefônica Brasil, S.A. | 2018 | Nonconvertible bonds ( Telemig) II    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 2  
Outside of Parent Country | Telefônica Brasil, S.A. | 2018 | Nonconvertible bonds ( Telemig) III    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 3  
Outside of Parent Country | Telefônica Brasil, S.A. | 2019    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 16  
Outside of Parent Country | Telefônica Brasil, S.A. | 2019 | Nonconvertible bonds    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefônica Brasil, S.A. | 2019 | Nonconvertible bonds    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefônica Brasil, S.A. | 2019 | Nonconvertible bonds    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefônica Brasil, S.A. | 2019 | Nonconvertible bonds    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 10  
Outside of Parent Country | Telefônica Brasil, S.A. | 2019 | Nonconvertible bonds ( Telemig) I    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1  
Outside of Parent Country | Telefônica Brasil, S.A. | 2019 | Nonconvertible bonds ( Telemig) II    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 2  
Outside of Parent Country | Telefônica Brasil, S.A. | 2019 | Nonconvertible bonds ( Telemig) III    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 3  
Outside of Parent Country | Telefônica Brasil, S.A. | 2020    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 258  
Outside of Parent Country | Telefônica Brasil, S.A. | 2020 | Nonconvertible bonds    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefônica Brasil, S.A. | 2020 | Nonconvertible bonds    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefônica Brasil, S.A. | 2020 | Nonconvertible bonds    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 252  
Outside of Parent Country | Telefônica Brasil, S.A. | 2020 | Nonconvertible bonds    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefônica Brasil, S.A. | 2020 | Nonconvertible bonds ( Telemig) I    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1  
Outside of Parent Country | Telefônica Brasil, S.A. | 2020 | Nonconvertible bonds ( Telemig) II    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 2  
Outside of Parent Country | Telefônica Brasil, S.A. | 2020 | Nonconvertible bonds ( Telemig) III    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 3  
Outside of Parent Country | Telefônica Brasil, S.A. | 2021    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 258  
Outside of Parent Country | Telefônica Brasil, S.A. | 2021 | Nonconvertible bonds    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefônica Brasil, S.A. | 2021 | Nonconvertible bonds    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 252  
Outside of Parent Country | Telefônica Brasil, S.A. | 2021 | Nonconvertible bonds    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefônica Brasil, S.A. | 2021 | Nonconvertible bonds    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefônica Brasil, S.A. | 2021 | Nonconvertible bonds ( Telemig) I    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 1  
Outside of Parent Country | Telefônica Brasil, S.A. | 2021 | Nonconvertible bonds ( Telemig) II    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 2  
Outside of Parent Country | Telefônica Brasil, S.A. | 2021 | Nonconvertible bonds ( Telemig) III    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 3  
Outside of Parent Country | Telefônica Brasil, S.A. | 2022    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 252  
Outside of Parent Country | Telefônica Brasil, S.A. | 2022 | Nonconvertible bonds    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefônica Brasil, S.A. | 2022 | Nonconvertible bonds    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 252  
Outside of Parent Country | Telefônica Brasil, S.A. | 2022 | Nonconvertible bonds    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefônica Brasil, S.A. | 2022 | Nonconvertible bonds    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefônica Brasil, S.A. | 2022 | Nonconvertible bonds ( Telemig) I    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefônica Brasil, S.A. | 2022 | Nonconvertible bonds ( Telemig) II    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefônica Brasil, S.A. | 2022 | Nonconvertible bonds ( Telemig) III    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 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 0  
Outside of Parent Country | Telefônica Brasil, S.A. | Subsequent years | Nonconvertible bonds    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefônica Brasil, S.A. | Subsequent years | Nonconvertible bonds    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefônica Brasil, S.A. | Subsequent years | Nonconvertible bonds    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefônica Brasil, S.A. | Subsequent years | Nonconvertible bonds    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefônica Brasil, S.A. | Subsequent years | Nonconvertible bonds ( Telemig) I    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefônica Brasil, S.A. | Subsequent years | Nonconvertible bonds ( Telemig) II    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Telefônica Brasil, S.A. | Subsequent years | Nonconvertible bonds ( Telemig) III    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds € 0  
Outside of Parent Country | Telefônica Brasil, S.A. | Floating interest rate | Nonconvertible bonds    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 0.68%  
Outside of Parent Country | Telefônica Brasil, S.A. | Floating interest rate | Nonconvertible bonds    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 8.25%  
Outside of Parent Country | Telefônica Brasil, S.A. | Floating interest rate | Nonconvertible bonds    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 0.24%  
Outside of Parent Country | Telefônica Brasil, S.A. | Floating interest rate | Nonconvertible bonds    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 4.00%  
Outside of Parent Country | Telefônica Brasil, S.A. | Floating interest rate | Nonconvertible bonds ( Telemig) I    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 0.50%  
Outside of Parent Country | Telefônica Brasil, S.A. | Floating interest rate | Nonconvertible bonds ( Telemig) II    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 0.50%  
Outside of Parent Country | Telefônica Brasil, S.A. | Floating interest rate | Nonconvertible bonds ( Telemig) III    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 0.50%  
Outside of Parent Country | Colombia Telecomunicaciones, S.A, ESP    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds € 625  
Outside of Parent Country | Colombia Telecomunicaciones, S.A, ESP | BOND R144-A    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 625  
Outside of Parent Country | Colombia Telecomunicaciones, S.A, ESP | 2018    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Colombia Telecomunicaciones, S.A, ESP | 2018 | BOND R144-A    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Colombia Telecomunicaciones, S.A, ESP | 2019    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Colombia Telecomunicaciones, S.A, ESP | 2019 | BOND R144-A    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Colombia Telecomunicaciones, S.A, ESP | 2020    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Colombia Telecomunicaciones, S.A, ESP | 2020 | BOND R144-A    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Colombia Telecomunicaciones, S.A, ESP | 2021    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Colombia Telecomunicaciones, S.A, ESP | 2021 | BOND R144-A    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Colombia Telecomunicaciones, S.A, ESP | 2022    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 625  
Outside of Parent Country | Colombia Telecomunicaciones, S.A, ESP | 2022 | BOND R144-A    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 625  
Outside of Parent Country | Colombia Telecomunicaciones, S.A, ESP | Subsequent years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | Colombia Telecomunicaciones, S.A, ESP | Subsequent years | BOND R144-A    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds € 0  
Outside of Parent Country | Colombia Telecomunicaciones, S.A, ESP | Fixed interest rate | BOND R144-A    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 5.375%  
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs, GmbH    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds € 1,100  
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs, GmbH | 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 | Bond    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 500  
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs, GmbH | 2018    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 600  
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs, GmbH | 2018 | 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 | 2018 | 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 | 2019    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs, GmbH | 2019 | 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 | 2019 | 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 | 2020    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs, GmbH | 2020 | 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 | 2020 | 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 | 2021    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 500  
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs, GmbH | 2021 | 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 | 2021 | Bond    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 500  
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs, GmbH | 2022    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Debentures and bonds 0  
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs, GmbH | 2022 | 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 | 2022 | 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 | 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 | 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 | 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 | Fixed interest rate | Bond    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 1.875%  
Outside of Parent Country | O2 Telefónica Deutschland Finanzierungs, GmbH | Fixed interest rate | Bond    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest rate (as a percent) 2.375%