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Earnings per Share (Detail) $ / shares in Units, shares in Thousands, $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) shares | Dec. 31, 2020 MXN ($) $ / shares shares | Dec. 31, 2019 MXN ($) $ / shares shares | Dec. 31, 2018 MXN ($) $ / shares shares
Earnings per share [line items] |  |  |  |
Net controlling interest income allocated from continuing operations | $ (98) | $ (1,930) | $ 20,699 | $ 22,560
Net controlling interest income allocated from discontinued operations | $ |  |  |  | $ 1,430
Series B shares [member] |  |  |  |
Earnings per share [line items] |  |  |  |
Weighted average number of shares for basic earnings per share | shares | 9,243,590 | 9,243,590 | 9,244,160 | 9,243,810
Effect of dilution associated with non-vested shares for share based payment plans | shares | 2,830 | 2,830 | 2,260 | 2,610
Weighted average number of shares adjusted for the effect of dilution (Shares outstanding) | shares | 9,246,420 | 9,246,420 | 9,246,420 | 9,246,420
Dividend rights per series (see Note 22.1) | 100.00% | 100.00% | 100.00% | 100.00%
Weighted average number of shares further adjusted to reflect dividend rights | shares | 9,246,420 | 9,246,420 | 9,246,420 | 9,246,420
Basic earnings per share from continuing operations | $ / shares |  | $ (0.10) | $ 1.03 | $ 1.13
Basic earnings per share from discontinued operations | $ / shares |  |  |  | 0.07
Diluted earnings per share from continuing operations | $ / shares |  | $ (0.10) | $ 1.03 | 1.13
Diluted earnings per share from discontinued operations | $ / shares |  |  |  | $ 0.07
Allocation of earnings, weighted | 46.11% | 46.11% | 46.11% | 46.11%
Net controlling interest income allocated from continuing operations | $ |  | $ (890) | $ 9,545 | $ 10,403
Net controlling interest income allocated from discontinued operations | $ |  |  |  | $ 660
Series D shares [member] |  |  |  |
Earnings per share [line items] |  |  |  |
Weighted average number of shares for basic earnings per share | shares | 8,633,380 | 8,633,380 | 8,635,650 | 8,634,260
Effect of dilution associated with non-vested shares for share based payment plans | shares | 11,330 | 11,330 | 9,060 | 10,450
Weighted average number of shares adjusted for the effect of dilution (Shares outstanding) | shares | 8,644,710 | 8,644,710 | 8,644,710 | 8,644,710
Dividend rights per series (see Note 22.1) | 125.00% | 125.00% | 125.00% | 125.00%
Weighted average number of shares further adjusted to reflect dividend rights | shares | 10,805,890 | 10,805,890 | 10,805,890 | 10,805,890
Basic earnings per share from continuing operations | $ / shares |  | $ (0.12) | $ 1.29 | $ 1.41
Basic earnings per share from discontinued operations | $ / shares |  |  |  | 0.09
Diluted earnings per share from continuing operations | $ / shares |  | $ (0.12) | $ 1.29 | 1.41
Diluted earnings per share from discontinued operations | $ / shares |  |  |  | $ 0.09
Allocation of earnings, weighted | 53.89% | 53.89% | 53.89% | 53.89%
Net controlling interest income allocated from continuing operations | $ |  | $ (1,040) | $ 11,154 | $ 12,157
Net controlling interest income allocated from discontinued operations | $ |  |  |  | $ 770

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