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Basis of Preparation - Cash Flow Reconciliation (Details) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) | [1] | Dec. 31, 2020 MXN ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($)
Disclosure of Detailed Information About Investment Property [line items] |  |  |  |  |
Amortization | $ 51 | $ 1,020 | $ 1,062 | [2] | $ 998
Amortization prepaid expenses | 29 | 577 | 638 | [2] | 626
Other tax | 159 | 3,162 | 404 | [2] | 6
Income taxes paid | (251) | (4,990) | (5,210) | [2] | (6,188)
Acquisitions of intangible assets | (15) | (289) | (698) | [2] | (674)
Other non-current assets | $ (16) | $ (325) | (711) | [2] | (681)
Previously Reported |  |  |  |  |
Disclosure of Detailed Information About Investment Property [line items] |  |  |  |  |
Amortization |  |  | 1,700 |  | 1,624
Income taxes paid |  |  | (4,806) |  | (6,182)
Acquisitions of intangible assets |  |  | (1,421) |  | (1,373)
Other non-current assets |  |  | $ (12) |  | $ (18)
[1] | Convenience translation to U.S. dollars ($) – See Note 2.2.3
[2] | The Company initially adopted IFRS 16 at January 1, 2019 using the modified retrospective approach under which the comparative information is not restated. – See Note 3.18

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