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Discontinued operations - Summary of the Discontinued Operation (Parenthetical) (Detail)
$ in Millions, $ in Millions
Dec. 31, 2020
USD ($)
 [1]
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
 [2]
Dec. 31, 2018
MXN ($)
Disclosure of analysis of single amount of discontinued operations [line items]        
Cash and cash equivalents $ 2,187 $ 43,497 $ 20,491  
Philippines        
Disclosure of analysis of single amount of discontinued operations [line items]        
Cash and cash equivalents       $ 6,898
[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