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Earnings per Share - Summary of Basic and Diluted Earnings per Share (Detail) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2024 MXN ($) $ / shares shares | Dec. 31, 2024 $ / shares | Dec. 31, 2023 MXN ($) $ / shares shares | Dec. 31, 2023 $ / shares | Dec. 31, 2022 MXN ($) $ / shares shares | Dec. 31, 2022 $ / shares
Earnings per share [line items] |  |  |  |  |  |
Consolidated net income | $ 24,549 |  | $ 20,226 |  | $ 19,626 |
Consolidated net income attributable to equity holders of the parent | $ 23,729 |  | $ 19,536 |  | $ 19,034 |
Weighted average number of shares for basic earnings per share (millions of shares) | shares | 16,807 |  | 16,807 |  | 16,807 |
Earnings per share | (per share) | $ 1.41 | $ 1.41 | $ 1.16 | $ 1.16 | $ 1.13 | $ 1.13
"A" shares |  |  |  |  |  |
Earnings per share [line items] |  |  |  |  |  |
Consolidated net income | $ 11,593 |  | $ 9,551 |  | $ 9,268 |
Consolidated net income attributable to equity holders of the parent | $ 11,205 |  | $ 9,225 |  | $ 8,989 |
Weighted average number of shares for basic earnings per share (millions of shares) | shares | 7,937 |  | 7,937 |  | 7,937 |
"D" shares |  |  |  |  |  |
Earnings per share [line items] |  |  |  |  |  |
Consolidated net income | $ 6,819 |  | $ 5,618 |  | $ 5,451 |
Consolidated net income attributable to equity holders of the parent | $ 6,591 |  | $ 5,426 |  | $ 5,287 |
Weighted average number of shares for basic earnings per share (millions of shares) | shares | 4,668 |  | 4,668 |  | 4,668 |
"B" shares |  |  |  |  |  |
Earnings per share [line items] |  |  |  |  |  |
Consolidated net income | $ 2,301 |  | $ 1,896 |  | $ 1,840 |
Consolidated net income attributable to equity holders of the parent | $ 2,225 |  | $ 1,831 |  | $ 1,784 |
Weighted average number of shares for basic earnings per share (millions of shares) | shares | 1,576 |  | 1,576 |  | 1,576 |
"L" shares |  |  |  |  |  |
Earnings per share [line items] |  |  |  |  |  |
Consolidated net income | $ 3,836 |  | $ 3,161 |  | $ 3,067 |
Consolidated net income attributable to equity holders of the parent | $ 3,708 |  | $ 3,054 |  | $ 2,974 |
Weighted average number of shares for basic earnings per share (millions of shares) | shares | 2,626 |  | 2,626 |  | 2,626 |

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