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Other Liabilities, Provisions and Commitments - Summary of Nature and Amount of Loss Contingencies Recorded (Detail) - MXN ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Disclosure of other provisions [line items] |  |  |  |
Provisions | $ 8,298 | $ 11,067 |  |
Tax [member] |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Provisions | 5,038 | 6,717 | $ 10,223 | $ 1,658
Labor [member] |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Provisions | 2,340 | 2,365 | 2,356 | 1,340
Legal [member] |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Provisions | $ 920 | $ 1,985 | $ 1,049 | $ 319

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