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Non Controlling Interest in Consolidated Subsidiaries - Summary of Non Controlling Interest (Detail)
$ in Millions, $ in Millions
 12 Months Ended
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