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Leases - Schedule of Company's Lease Liabilities (Detail)
$ in Millions, $ in Millions
Dec. 31, 2020
USD ($)
 [1]
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Disclosure of maturity analysis of operating lease payments [line items]      
Lease liabilities   $ 1,306 $ 1,383
Current $ 28 560 483 [2]
Non-current lease liabilities $ 38 746 900 [2]
Less than one year      
Disclosure of maturity analysis of operating lease payments [line items]      
Lease liabilities   560 483
One to three years      
Disclosure of maturity analysis of operating lease payments [line items]      
Lease liabilities   306 238
More than three years      
Disclosure of maturity analysis of operating lease payments [line items]      
Lease liabilities   $ 440 $ 662
[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