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Basis of Preparation of the Consolidated Financial Statements and Summary of Significant Accounting Policies and Practices - Schedule of Impact in Consolidated Financial Statements upon Application of Hyperinflation (Parenthetical) (Detail) $ in Thousands, $ 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 corporate information [Line Items] |  |  |  |
Hyperinflation adjustment | $ (15,826,934) |  |  |
Net effect | 139,557,171 | $ 7,090 | $ 100,143,303 | $ 109,610,310
Argentina [member] | Impact of application of hyperinflation adjustments in 2018 [member] |  |  |  |
Disclosure of corporate information [Line Items] |  |  |  |
Hyperinflation adjustment | 15,826,934 |  |  |
Net effect | $ 945,647 |  |  |

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