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Equity - Summary of Dividends Declared and Paid (Detail) - MXN ($) $ / shares in Units, $ in Millions |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 05, 2020 | Nov. 03, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of dividends [Line Items] |  |  |  |  |
Dividends declared and paid |  | $ 10,588 | $ 10,588 | $ 10,210 | $ 7,437
Dividends declared and paid per share | $ 5.04 |  |  |  |
A |  |  |  |  |
Disclosure of dividends [Line Items] |  |  |  |  |
Dividends declared and paid |  |  | 5,000 | 4,822 | 3,512
D |  |  |  |  |
Disclosure of dividends [Line Items] |  |  |  |  |
Dividends declared and paid |  |  | 2,941 | 2,836 | 2,066
Series L shares, without par value |  |  |  |  |
Disclosure of dividends [Line Items] |  |  |  |  |
Dividends declared and paid |  |  | 1,654 | 1,595 | 1,162
B |  |  |  |  |
Disclosure of dividends [Line Items] |  |  |  |  |
Dividends declared and paid |  |  | $ 993 | $ 957 | $ 697

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