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Basis of Preparation - Additional Information (Detail) $ in Millions, $ in Millions | Mar. 06, 2019 $ / $ | Dec. 31, 2018 MXN ($) $ / $ | Dec. 31, 2018 USD ($) $ / $ | Jan. 01, 2018 MXN ($) | Dec. 31, 2017 MXN ($) / $
--- | --- | --- | --- | --- | ---
Disclosure of Detailed Information About Investment Property [line items] |  |  |  |  |
Exchange Rate |  | 19.6350 | 19.6350 |  |
Increase decrease in foreign currency exchange rate |  | 1.60% | 1.60% |  |
Retained earnings |  | $ 71,270 | $ 3,630 |  | $ 61,786
Adoption of IAS 29 for Argentina [member] |  |  |  |  |
Disclosure of Detailed Information About Investment Property [line items] |  |  |  |  |
Retained earnings | $ |  |  |  | $ 87 |
Percentage of total portfolio maintained at the date of adoption |  |  |  | 1.00% |
Venezuela [member] |  |  |  |  |
Disclosure of Detailed Information About Investment Property [line items] |  |  |  |  |
Exchange Rate | / $ |  |  |  |  | 22,793
Foreign currency exchange [member] |  |  |  |  |
Disclosure of Detailed Information About Investment Property [line items] |  |  |  |  |
Exchange Rate | 19.3065 |  |  |  |

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