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Equity - Summary of Dividends Declared and Paid (Detail) - MXN ($) |  | 12 Months Ended
--- | --- | ---
May 05, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of dividends [Line Items] |  |  |  |
Dividends declared and paid | $ 10,210 | $ 10,210 | $ 7,437 | $ 7,038
Dividends declared and paid per share | $ 0 |  |  |
A |  |  |  |
Disclosure of dividends [Line Items] |  |  |  |
Dividends declared and paid |  | 4,822 | 3,512 | 3,323
D |  |  |  |
Disclosure of dividends [Line Items] |  |  |  |
Dividends declared and paid |  | 2,836 | 2,066 | 1,955
Series L shares, without par value |  |  |  |
Disclosure of dividends [Line Items] |  |  |  |
Dividends declared and paid |  | 1,595 | 1,162 | 1,100
B |  |  |  |
Disclosure of dividends [Line Items] |  |  |  |
Dividends declared and paid |  | $ 957 | $ 697 | $ 660

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