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Earnings per Share - Summary of Basic and Diluted Earnings per Share (Detail) - MXN ($) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Earnings per share [line items] |  |  |
Consolidated net income | $ 16,331 | $ 10,368 | $ 12,630
"A" shares |  |  |
Earnings per share [line items] |  |  |
Consolidated net income | 7,712 | 4,896 | 5,965
Consolidated net income attributable to equity holders of the parent | $ 7,418 | $ 4,868 | $ 5,715
Weighted average number of shares for basic earnings per share (millions of shares) | 7,937 | 7,937 | 7,937
"D" shares |  |  |
Earnings per share [line items] |  |  |
Consolidated net income | $ 4,536 | $ 2,880 | $ 3,508
Consolidated net income attributable to equity holders of the parent | $ 4,363 | $ 2,863 | $ 3,360
Weighted average number of shares for basic earnings per share (millions of shares) | 4,668 | 4,668 | 4,668
"B" shares |  |  |
Earnings per share [line items] |  |  |
Consolidated net income | $ 1,531 | $ 972 | $ 1,184
Consolidated net income attributable to equity holders of the parent | $ 1,473 | $ 966 | $ 1,135
Weighted average number of shares for basic earnings per share (millions of shares) | 1,576 | 1,576 | 1,576
Series L shares, without par value |  |  |
Earnings per share [line items] |  |  |
Consolidated net income | $ 2,552 | $ 1,620 | $ 1,973
Consolidated net income attributable to equity holders of the parent | $ 2,454 | $ 1,610 | $ 1,891
Weighted average number of shares for basic earnings per share (millions of shares) | 2,626 | 2,626 | 2,626

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