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Financial Instruments - Summary of Net Effect of Changes in Fair Value of Derivative Financial Instruments 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)
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
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)
Derivatives Not Designated For Hedge Accounting | 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 (12)
Derivatives Not Designated For Hedge Accounting | 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) $ (116)
[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