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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
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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

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