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Investments - Schedule of Investments Classified as Amortized Cost (Detail) $ in Millions, $ in Millions | Jun. 30, 2019 MXN ($) | Jun. 30, 2019 USD ($) | [1],[2] | Dec. 31, 2018 MXN ($)
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Disclosure Of Investments [line items] |  |  |  |
Total investments | $ 21,340 | [1] | $ 1,111 | $ 30,924
Fixed rate debt [member] |  |  |  |
Disclosure Of Investments [line items] |  |  |  |
Total fixed rate/variable rate | 519 |  |  | 910
Fixed rate debt [member] | Corporate debt securities [member] |  |  |  |
Disclosure Of Investments [line items] |  |  |  |
Acquisition cost | 518 |  |  | 906
Accrued interest | 1 |  |  | 4
Variable rate debt [member] |  |  |  |
Disclosure Of Investments [line items] |  |  |  |
Total fixed rate/variable rate | 20,821 |  |  | 30,014
Variable rate debt [member] | US Government agencies debt securities [member] |  |  |  |
Disclosure Of Investments [line items] |  |  |  |
Acquisition cost | 3,834 |  |  | 8,660
Accrued interest | 15 |  |  | 28
Variable rate debt [member] | Corporate debt securities [member] |  |  |  |
Disclosure Of Investments [line items] |  |  |  |
Acquisition cost | 16,868 |  |  | 21,259
Accrued interest | $ 104 |  |  | $ 67
[1] | The Company initially adopted IFRS 16 at January 1st, 2019 using the modified retrospective method under which the comparative information is not restated. - See Note 2.4.1
[2] | Convenience translation to U.S. dollars ($) - See Note 2.2.3

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