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Other Liabilities, Provisions, Contingencies and Commitments - Changes in Balance of Provisions Recorded (Parenthetical) (Detail) - MXN ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of financial liabilities [line items] |  |
Indemnifiable assets | $ 4,510 | $ 8,081
Indirect taxes [Member] |  |
Disclosure of financial liabilities [line items] |  |
Tax claims | 7,840 |
Deductibility of a tax goodwill | 5,321 |
Contingencies guaranteed agreements | 8,081 |
Indemnifiable assets | $ 1,874 |

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