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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Major components of tax expense (income) [abstract] |  |  |
Balance at beginning of the period | $ 17,557 | $ 22,000 | $ 22,129
Increase | 266 | 2,002 | 10,610
Usage of tax losses | (5,939) | (5,685) | (10,706)
Effect of foreign currency exchange rates | (613) | (760) | (33)
Balance at end of the period | $ 11,271 | $ 17,557 | $ 22,000

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