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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, 2019 USD ($) | [1] | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2017 MXN ($)
Disclosure Of Non Controlling Interests [abstract] |  |  |  |  |
Balance at beginning of the period |  | $ 6,806 |  | $ 18,141 | $ 7,096
Effects of business combination |  |  |  |  | 11,072
Net income of non-controlling interest |  | 529 |  | 1,159 | 1,148
Exchange differences on translation of foreign operations |  | (565) |  | (1,338) | (1,138)
Re-measurements of the net defined employee benefit liability |  |  |  | 37 | 38
Valuation of the effective portion of derivative financial instruments, net of taxes |  | (16) |  | (41) | (74)
Dividends paid |  | (3) |  |  | (1)
Accounting standard adoption effects (see Note 2.4) |  |  |  | (12) |
Philippines deconsolidation |  |  |  | (11,140) |
Balance at end of the period | $ 358 | $ 6,751 | [2] | $ 6,806 | $ 18,141
[1] | Convenience translation to U.S. dollars ($) – See Note 2.2.3
[2] | 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 2.4.1

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