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Balances and Transactions in Foreign Currencies - Summary of Transactions Denominated in Foreign Currencies, Expressed in Mexican pesos (Detail)
€ in Millions, $ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
MXN ($)
 [2]
Dec. 31, 2019
EUR (€)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
MXN ($)
Disclosure of Balances and Transactions in Foreign Currencies [line items]              
Revenues $ 9,231 [1] $ 183,615   $ 194,471     $ 182,342
Interest Expense 397 [1] $ 7,894   $ 6,904     $ 7,568
U.S. dollars              
Disclosure of Balances and Transactions in Foreign Currencies [line items]              
Revenues | $ 462   $ 1,506     $ 1,481  
Purchases of Raw Materials | $ 12,801   14,307     18,129  
Interest Expense | $ 3,418   1,910     2,223  
Other | $ $ 2,213   $ 2,723     $ 2,161  
Euros              
Disclosure of Balances and Transactions in Foreign Currencies [line items]              
Revenues | €         € 0    
Purchases of Raw Materials | €         454    
Interest Expense | €         0    
Other | €         € 0    
[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