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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
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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

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