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Intangible Assets and Goodwill, Net - Changes in intangible assets with definite useful lives (Details) - MXN ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Analysis of the changes in intangible assets |  |
Balance at beginning of the period | $ 43,328,954 |
Balance at end of the period | 42,724,218 | $ 43,328,954
Concessions |  |
Analysis of the changes in intangible assets |  |
Balance at beginning of the period | 15,166,067 | 15,166,067
Balance at end of the period | 15,166,067 | 15,166,067
Intangible Assets with Finite Useful Lives |  |
Analysis of the changes in intangible assets |  |
Balance at beginning of the period | 13,873,817 |
Balance at end of the period | 13,409,283 | 13,873,817
Intangible Assets with Finite Useful Lives | Trademarks |  |
Analysis of the changes in intangible assets |  |
Balance at beginning of the period | 228,510 |
Amortization of the year |  | 321,520
Balance at end of the period | 255,782 | 228,510
Intangible Assets with Finite Useful Lives | Concessions |  |
Analysis of the changes in intangible assets |  |
Balance at beginning of the period | 221,402 |
Amortization of the year | 110,701 | 110,701
Balance at end of the period | 110,701 | 221,402
Intangible Assets with Finite Useful Lives | Licenses and software |  |
Analysis of the changes in intangible assets |  |
Balance at beginning of the period | 4,015,219 |
Balance at end of the period | 4,692,574 | 4,015,219
Intangible Assets with Finite Useful Lives | List of subscribers |  |
Analysis of the changes in intangible assets |  |
Balance at beginning of the period | 2,150,433 |
Balance at end of the period | 1,546,264 | 2,150,433
Intangible Assets with Finite Useful Lives | Payments for renewal of concessions |  |
Analysis of the changes in intangible assets |  |
Balance at beginning of the period | 5,821,828 |
Balance at end of the period | 5,825,559 | 5,821,828
Intangible Assets with Finite Useful Lives | Other intangible assets |  |
Analysis of the changes in intangible assets |  |
Balance at beginning of the period | 1,436,425 |
Balance at end of the period | 978,403 | 1,436,425
Cost |  |
Analysis of the changes in intangible assets |  |
Balance at beginning of the period | 62,798,367 |
Transfers to property, plant and equipment | 1,045,065 | 1,487,056
Balance at end of the period | 65,034,704 | 62,798,367
Cost | Intangible Assets with Finite Useful Lives |  |
Analysis of the changes in intangible assets |  |
Balance at beginning of the period | 33,343,230 | 30,389,457
Additions | 1,235,177 | 2,106,750
Transfers from property, plant and equipment | 1,247,347 | 1,487,056
Transfers to property, plant and equipment | (202,282) |
Retirements | (53,140) | (855,838)
Transfers and reclassifications | 127,526 | 236,391
Effect of translation | 21,911 | (20,586)
Balance at end of the period | 35,719,769 | 33,343,230
Cost | Intangible Assets with Finite Useful Lives | Trademarks |  |
Analysis of the changes in intangible assets |  |
Balance at beginning of the period | 2,127,697 | 1,891,306
Transfers and reclassifications | 99,399 | 236,391
Balance at end of the period | 2,227,096 | 2,127,697
Cost | Intangible Assets with Finite Useful Lives | Concessions |  |
Analysis of the changes in intangible assets |  |
Balance at beginning of the period | 553,505 | 553,505
Balance at end of the period | 553,505 | 553,505
Cost | Intangible Assets with Finite Useful Lives | Licenses and software |  |
Analysis of the changes in intangible assets |  |
Balance at beginning of the period | 10,858,388 | 9,065,582
Additions | 959,813 | 913,108
Transfers from property, plant and equipment | 1,247,347 | 1,487,056
Retirements | (28,127) | (526,166)
Transfers and reclassifications | 84,823 | (68,641)
Effect of translation | 17,236 | (12,551)
Balance at end of the period | 13,139,480 | 10,858,388
Cost | Intangible Assets with Finite Useful Lives | List of subscribers |  |
Analysis of the changes in intangible assets |  |
Balance at beginning of the period | 8,782,852 | 8,785,423
Transfers and reclassifications | 16,428 | 1,162
Effect of translation | 5,054 | (3,733)
Balance at end of the period | 8,804,334 | 8,782,852
Cost | Intangible Assets with Finite Useful Lives | Payments for renewal of concessions |  |
Analysis of the changes in intangible assets |  |
Balance at beginning of the period | 5,821,828 | 5,993,891
Additions | 3,731 | 67,285
Retirements |  | (239,348)
Balance at end of the period | 5,825,559 | 5,821,828
Cost | Intangible Assets with Finite Useful Lives | Other intangible assets |  |
Analysis of the changes in intangible assets |  |
Balance at beginning of the period | 5,198,960 | 4,099,750
Additions | 271,633 | 1,126,357
Transfers to property, plant and equipment | (202,282) |
Retirements | (25,013) | (90,324)
Transfers and reclassifications | (73,124) | 67,479
Effect of translation | (379) | (4,302)
Balance at end of the period | 5,169,795 | 5,198,960
Accumulated Amortisation |  |
Analysis of the changes in intangible assets |  |
Balance at beginning of the period | (19,469,413) |
Balance at end of the period | (22,310,486) | (19,469,413)
Accumulated Amortisation | Intangible Assets with Finite Useful Lives |  |
Analysis of the changes in intangible assets |  |
Balance at beginning of the period | (19,469,413) | (17,085,043)
Amortization of the year | (2,474,510) | (2,500,646)
Other amortization of the year | (380,863) | 531,426
Retirements | 30,130 | 631,738
Effect of translation | (15,830) | 15,964
Balance at end of the period | (22,310,486) | (19,469,413)
Accumulated Amortisation | Intangible Assets with Finite Useful Lives | Trademarks |  |
Analysis of the changes in intangible assets |  |
Balance at beginning of the period | (1,899,187) | (1,569,786)
Amortization of the year | (72,127) | (329,401)
Balance at end of the period | (1,971,314) | (1,899,187)
Accumulated Amortisation | Intangible Assets with Finite Useful Lives | Concessions |  |
Analysis of the changes in intangible assets |  |
Balance at beginning of the period | (332,103) | (221,402)
Amortization of the year | (110,701) | (110,701)
Balance at end of the period | (442,804) | (332,103)
Accumulated Amortisation | Intangible Assets with Finite Useful Lives | Licenses and software |  |
Analysis of the changes in intangible assets |  |
Balance at beginning of the period | (6,843,169) | (5,934,647)
Amortization of the year | (1,717,282) | (1,490,841)
Retirements | 28,127 | 529,403
Reclassifications | 96,304 | 44,824
Effect of translation | (10,886) | 8,092
Balance at end of the period | (8,446,906) | (6,843,169)
Accumulated Amortisation | Intangible Assets with Finite Useful Lives | List of subscribers |  |
Analysis of the changes in intangible assets |  |
Balance at beginning of the period | (6,632,419) | (6,108,251)
Amortization of the year | (523,878) | (530,013)
Reclassifications | (96,719) | 2,112
Effect of translation | (5,054) | 3,733
Balance at end of the period | (7,258,070) | (6,632,419)
Accumulated Amortisation | Intangible Assets with Finite Useful Lives | Payments for renewal of concessions |  |
Analysis of the changes in intangible assets |  |
Balance at beginning of the period |  | (15,454)
Amortization of the year |  | (7,773)
Retirements |  | 23,227
Accumulated Amortisation | Intangible Assets with Finite Useful Lives | Other intangible assets |  |
Analysis of the changes in intangible assets |  |
Balance at beginning of the period | (3,762,535) | (3,235,503)
Amortization of the year | (50,522) | (31,917)
Other amortization of the year | (380,863) | 531,426
Retirements | 2,003 | 79,108
Reclassifications | 415 | (46,936)
Effect of translation | 110 | 4,139
Balance at end of the period | $ (4,191,392) | $ (3,762,535)

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