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Non Controlling Interest in Consolidated Subsidiaries - Summary of Non Controlling Interest (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) | [2] | Dec. 31, 2020 MXN ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($)
Disclosure of non controlling interest in consolidated subsidiaries [Abstract] |  |  |  |  |  |
Balance at beginning of the period |  | $ 6,751 | [1] | $ 6,806 |  | $ 18,141
Net income of non-controlling interest |  | 61 |  | 529 |  | 1,159
Exchange differences on translation of foreign operations |  | (1,261) |  | (565) |  | (1,338)
Re-measurements of the net defined employee benefit liability |  | 0 |  | 0 |  | 37
Valuation of the effective portion of derivative financial instruments, net of taxes |  | 100 |  | (16) |  | (41)
Dividends paid |  | (68) |  | (3) |  | 0
Accounting standard adoption effects |  | 0 |  | 0 |  | (12)
Philippines deconsolidation |  | 0 |  | 0 |  | (11,140)
Balance at end of the period | $ 281 | $ 5,583 |  | $ 6,751 | [1] | $ 6,806
[1] | The Company initially adopted IFRS 16 on January 1, 2019 using the modified retrospective approach under which the comparative information is not restated. – See Note 3.18
[2] | Convenience translation to U.S. dollars ($) – See Note 2.2.3

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