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Financial Instruments - Summary of Net Effect of Expired contracts that did not Meet Hedging Criteria for Accounting Purposes (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
 [1]
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Disclosure of net effect of changes in fair value of derivative financial instruments that did not meet hedging criteria for accounting purposes [line items]        
Market value (loss) gain on financial instruments $ (11) $ (212) $ (288) [2] $ (314)
Cross currency swaps and interest rate swaps        
Disclosure of net effect of changes in fair value of derivative financial instruments that did not meet hedging criteria for accounting purposes [line items]        
Market value (loss) gain on financial instruments   (212) (293) (186)
Embedded derivatives        
Disclosure of net effect of changes in fair value of derivative financial instruments that did not meet hedging criteria for accounting purposes [line items]        
Market value (loss) gain on financial instruments   $ 0 $ 4 $ 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