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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 | 12 Months Ended
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Dec. 31, 2018 MXN ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($)
Disclosure of Balances and Transactions in Foreign Currencies [line items] |  |  |  |
Revenues | $ 182,342 | $ 9,286 | $ 183,256 | $ 177,718
Interest expense | 7,568 | $ 385 | 8,777 | 7,471
U.S. dollars [member] |  |  |  |
Disclosure of Balances and Transactions in Foreign Currencies [line items] |  |  |  |
Revenues | 1,481 |  | 653 | 736
Purchases of Raw Materials | 18,129 |  | 13,381 | 13,242
Interest expense | 2,223 |  | 2,454 | 2,235
Other | $ 2,161 |  | 1,544 | $ 1,796
Euros [member] |  |  |  |
Disclosure of Balances and Transactions in Foreign Currencies [line items] |  |  |  |
Purchases of Raw Materials |  |  | $ 18 |

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