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Income Taxes - Summary of Temporary Differences Giving Rise to Deferred Income Tax Liabilities (Assets) (Parenthetical) (Detail) $ in Millions, $ in Millions | Dec. 31, 2018 MXN ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($)
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Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax liability | $ 2,856 | $ 145 | $ 1,714 |
Venezuela [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax liability |  |  |  | $ 1,107

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