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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, 2021 USD ($) | Dec. 31, 2021 MXN ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 MXN ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2019 EUR (€)
Disclosure of Balances and Transactions in Foreign Currencies [line items] |  |  |  |  |  |  |
Revenues |  | $ 194,804 |  | $ 183,615 |  | $ 194,471 |
Interest Expense |  | $ 6,192 |  | $ 7,894 |  | $ 6,904 |
U.S. dollars |  |  |  |  |  |  |
Disclosure of Balances and Transactions in Foreign Currencies [line items] |  |  |  |  |  |  |
Revenues | $ 452 |  | $ 462 |  | $ 1,506 |  |
Purchases of Raw Materials | 14,420 |  | 12,801 |  | 14,307 |  |
Interest Expense | 1,749 |  | 3,418 |  | 1,910 |  |
Other | $ 2,509 |  | $ 2,213 |  | $ 2,723 |  |
Euros |  |  |  |  |  |  |
Disclosure of Balances and Transactions in Foreign Currencies [line items] |  |  |  |  |  |  |
Revenues | € |  |  |  |  |  |  | € 0
Purchases of Raw Materials | € |  |  |  |  |  |  | 454
Interest Expense | € |  |  |  |  |  |  | 0
Other | € |  |  |  |  |  |  | € 0

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