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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, 2018 MXN ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($)
Disclosure Of Non Controlling Interests [abstract] |  |  |  |
Balance at beginning of the period | $ 18,141 |  | $ 7,096 | $ 3,986
Effects of business combination |  |  | 11,072 |
Net income of non-controlling interest | 1,159 |  | 1,148 | 457
Exchange differences on translation of foreign operations | (1,338) |  | (1,138) | 1,845
Re-measurements of the net defined employee benefit liability | 37 |  | 38 |
Valuation of the effective portion of derivative financial instruments, net of taxes | (41) |  | (74) | 51
Increase in shares of non-controlling interest |  |  |  | 826
Dividends paid |  |  | (1) | (69)
Accounting standard adoption effects (see Note 2.4) | (12) |  |  |
Philippines deconsolidation | (11,140) |  |  |
Balance at end of the period | $ 6,806 | $ 347 | $ 18,141 | $ 7,096

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