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Non Controlling Interest in Consolidated Subsidiaries - Summary of Non Controlling Interest in Consolidated Subsidiaries (Detail)
$ in Millions, $ in Millions
Dec. 31, 2020
USD ($)
 [1]
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Disclosure of non controlling interest in consolidated subsidiaries [Line Items]          
Non-controlling interests $ 281 $ 5,583 $ 6,751 [2] $ 6,806 $ 18,141
Mexico          
Disclosure of non controlling interest in consolidated subsidiaries [Line Items]          
Non-controlling interests   4,823 5,671 5,700  
Colombia          
Disclosure of non controlling interest in consolidated subsidiaries [Line Items]          
Non-controlling interests   22 21 21  
Brazil          
Disclosure of non controlling interest in consolidated subsidiaries [Line Items]          
Non-controlling interests   $ 738 $ 1,059 $ 1,085  
[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 3.18