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Subsequent Events - Additional Information (Detail) $ in Thousands, $ in Billions |  |  | 12 Months Ended
--- | --- | --- | ---
Apr. 09, 2020 EUR (€) | Mar. 25, 2020 USD ($) | Mar. 25, 2020 EUR (€) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2017 MXN ($)
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |
Proceeds From Credit Facility |  |  |  | $ 8,273,440 | $ (34,050,923) | $ (27,433,489)
Borrowings |  |  |  | 624,254,477 | 638,922,453 |
U.S. dollars [member] |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |
Borrowings |  |  |  | 169,142,643 | 184,089,282 |
Euros [member] |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |
Borrowings |  |  |  | $ 222,190,375 | $ 236,548,891 |
Major borrowings [member] | U.S. dollars [member] | Revolving Syndicated Credit Facility One [member] |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |
Proceeds From Credit Facility |  | $ 2.5 |  |  |  |
Major borrowings [member] | Euros [member] |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |
Repayments of bonds | € | € 1,318,200 |  |  |  |  |
Borrowings | € | € 1,607,300 |  |  |  |  |
Major borrowings [member] | Euros [member] | Revolving Syndicated Credit Facility One [member] |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |
Proceeds From Credit Facility | € |  |  | € 2,000,000,000 |  |  |

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