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Investment (Details) $ in Millions, $ in Millions | Dec. 31, 2020 USD ($) | Dec. 31, 2020 MXN ($) | Dec. 31, 2019 MXN ($)
--- | --- | --- | ---
Disclosure Of Investments [line items] |  |  |
Total investments | $ 33 | $ 662 | $ 12,366
Fixed rate debt [member] |  |  |
Disclosure Of Investments [line items] |  |  |
Total investments |  | 662 | 1,052
Variable rate debt [member] |  |  |
Disclosure Of Investments [line items] |  |  |
Total investments |  |  | 11,314
Corporate Debt Securities1 [Member] | Fixed rate debt [member] |  |  |
Disclosure Of Investments [line items] |  |  |
Acquisition cost |  | 658 | 1,048
Accrued interest |  | $ 4 | 4
Corporate Debt Securities1 [Member] | Variable rate debt [member] |  |  |
Disclosure Of Investments [line items] |  |  |
Acquisition cost |  |  | 11,307
Accrued interest |  |  | $ 7

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