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Income Taxes - Additional Information (Detail) $ in Millions, $ in Millions |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 05, 2018 MXN ($) | Sep. 05, 2018 USD ($) | Apr. 06, 2018 MXN ($) | Apr. 06, 2018 USD ($) | Apr. 11, 2011 MXN ($) | Apr. 11, 2011 USD ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 | Dec. 31, 2014 MXN ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2017 USD ($)
Disclosure of Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
pre-tax income |  |  |  |  |  |  | $ 55,350 |  |  |  |  |  |
Deferred income tax liabilities |  |  |  |  |  |  | $ 3,333 |  |  |  |  | $ 984 |
Applicable income tax rate |  |  |  |  |  |  | 30.00% | 30.00% | 30.00% |  |  |  |
Prior year tax loss carryforwards value |  |  |  |  |  |  |  |  |  | $ 10,755 | $ 547 |  |
Increase in tax to be paid |  |  |  |  | $ 550 | $ 28 |  |  |  |  |  |  |
Income tax return 2012 [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax penalty imposed |  |  | $ 747 | $ 38 |  |  |  |  |  |  |  |  |
Income tax return 2011 [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax penalty imposed | $ 511 | $ 26 |  |  |  |  |  |  |  |  |  |  |
United States [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax liabilities |  |  |  |  |  |  |  |  |  |  |  |  | $ 700
Applicable income tax rate |  |  |  |  |  |  | 21.00% | 35.00% | 35.00% |  |  |  |
Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Increase (decrease) in net deferred tax assets |  |  |  |  |  |  |  | $ (124) |  |  |  |  |

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