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Trade Receivable, Net - Summary of Changes in Allowance for Expected Credit Losses (Detail) - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Trade and other current receivables [abstract] |  |  |
Balance at the beginning of the year | $ 515 | $ 493 | $ 595
Allowance for the year | 35 | 119 | 314
Charges and write-offs of uncollectible accounts | 6 | (29) | (397)
Added in business combinations | 0 | 0 | 4
Effects of changes in foreign exchange rates | (25) | (68) | (23)
Balance at the end of the year | $ 531 | $ 515 | $ 493

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