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Investments in Other Entities - Summary of Investments in Other Entities (Detail)
$ in Millions, $ in Millions
Dec. 31, 2020
USD ($)
 [1]
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Disclosure of investments in associates and other [line items]      
Investments in other entities $ 383 $ 7,623 $ 9,751 [2]
Investment in Associates and Joint Ventures | Investment in Associates and Joint Ventures      
Disclosure of investments in associates and other [line items]      
Investments in other entities   $ 7,623 $ 9,751
[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