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Taxes - Components of Income Tax Expense (Details) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2020 MXN ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($)
Disclosure Of Income Taxes [line items] |  |  |  |
Current tax expense |  | $ 18,690 | $ 11,652 | $ 10,480
Deferred tax expense (income): |  |  |  |
Origination and reversal of temporary differences |  | (5,824) | 127 | 491
(Recognition) of tax losses, net |  | 1,994 | (1,201) | (927)
Change in the statutory rate |  | (41) | (102) | 125
Total deferred tax income expense |  | (3,871) | (1,176) | (311)
Total income taxes | $ 745 | 14,819 | $ 10,476 | $ 10,169
Mexico [member] |  |  |  |
Disclosure Of Income Taxes [line items] |  |  |  |
Current tax expense |  | 5,500 |  |
Deferred tax expense (income): |  |  |  |
Total income taxes |  | 8,754 |  |
Penalties on income tax |  | 3,253 |  |
Restatement effects on income tax |  | $ 868 |  |

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