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Investments - Schedule of Investments Classified as Amortized Cost (Detail) $ in Millions, $ in Millions | Dec. 31, 2018 MXN ($) | Dec. 31, 2018 USD ($) | [1] | Dec. 31, 2017 MXN ($)
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Disclosure Of Investments [line items] |  |  |
Total investments | $ 30,924 | $ 1,575 | $ 2,160
Fixed rate debt [member] |  |  |
Disclosure Of Investments [line items] |  |  |
Total fixed rate/variable rate | 910 |  | 2,160
Fixed rate debt [member] | US Government agencies debt securities [member] |  |  |
Disclosure Of Investments [line items] |  |  |
Acquisition cost |  |  | 1,934
Fixed rate debt [member] | Corporate debt securities [member] |  |  |
Disclosure Of Investments [line items] |  |  |
Acquisition cost | 906 |  | 222
Accrued interest | 4 |  | $ 4
Variable rate debt [member] |  |  |
Disclosure Of Investments [line items] |  |  |
Total fixed rate/variable rate | 30,014 |  |
Variable rate debt [member] | US Government agencies debt securities [member] |  |  |
Disclosure Of Investments [line items] |  |  |
Acquisition cost | 8,660 |  |
Accrued interest | 28 |  |
Variable rate debt [member] | Corporate debt securities [member] |  |  |
Disclosure Of Investments [line items] |  |  |
Acquisition cost | 21,259 |  |
Accrued interest | $ 67 |  |
[1] | Convenience translation to U.S. dollars ($) - See Note 2.2.3

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