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Investments in Associates and Joint Ventures - Roll forward (Details) - MXN ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of Associate and Joint Ventures [Line Items] |  |  |  |  |
At January 1 |  | $ 9,762,432 | $ 9,762,432 | $ 10,546,728 |
Impairment loss in investment in shares of UHI |  |  | (5,455,356) |  |
Share of loss income of associates and joint ventures, net |  |  | (284,312) | 581,023 |
Foreign currency translation adjustments |  |  | 1,360,735 | (337,742) |
Other |  |  | 7,478 | (146,319) |
At December 31 |  |  | 22,813,531 | 9,762,432 | $ 10,546,728
Grupo de Telecomunicaciones de Alta Capacidad, S.A.P.I. de C.V. and subsidiaries ("GTAC") |  |  |  |  |
Disclosure of Associate and Joint Ventures [Line Items] |  |  |  |  |
At January 1 |  | 567,165 | 567,165 |  |
Long-term loans granted to GTAC, net |  |  | 132,926 | 172,223 |
Payment of principal and interest |  |  | (246,046) | (200,895) |
At December 31 |  |  | 514,731 | 567,165 |
UHI |  |  |  |  |
Disclosure of Associate and Joint Ventures [Line Items] |  |  |  |  |
At January 1 |  | 8,189,662 | 8,189,662 |  |
Impairment loss in investment in shares of UHI | $ (5,455,356) |  | (5,455,356) |  |
Exercise of warrants for UHI shares |  |  | 17,387,699 |  |
Share of income in OCEN for 2019 |  |  | 1,030 | (477,838) | $ (189,302)
At December 31 |  |  | 21,424,180 | 8,189,662 |
OCEN and subsidiaries |  |  |  |  |
Disclosure of Associate and Joint Ventures [Line Items] |  |  |  |  |
At January 1 |  | 693,970 | 693,970 |  |
Dividends from OCEN |  |  |  | (772,400) |
Capital stock reduction |  |  |  | (80,186) |
Share of income in OCEN for 2019 |  | $ 147,975 | 147,975 |  |
At December 31 |  |  | $ 556,251 | $ 693,970 |

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