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Income Taxes - Summary of Changes in Balance of Tax Loss Carryforwards (Detail) - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Major components of tax expense (income) [abstract] |  |  |
Balance at beginning of the period | $ 21,522 | $ 28,871 | $ 25,879
Increase | 5,768 | 4,985 | 6,029
Utilization of tax losses | (4,558) | (1,986) | (1,854)
Unused tax losses - 2028 to 2030 |  | (7,830) | 0
Effect of foreign currency exchange rates | (603) | (2,518) | (1,183)
Balance at end of the period | $ 22,129 | $ 21,522 | $ 28,871

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