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Earnings per Share - Summary of Calculation of Basic and Diluted Earnings Per Share Amounts (Detail) $ / shares in Units, shares in Thousands, $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2018 MXN ($) $ / shares shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 MXN ($) $ / shares shares | Dec. 31, 2016 MXN ($) $ / shares shares
Earnings per share [line items] |  |  |  |  |  |
Net controlling interest income allocated from continuing operations | $ 22,560 | $ 1,148 | [1] | $ 40,863 | [2] | $ 21,140
Net controlling interest income allocated from discontinued operations | $ 1,430 | $ 73 | [1] | $ 1,545 | [2] |
Series B shares [member] |  |  |  |  |  |
Earnings per share [line items] |  |  |  |  |  |
Weighted average number of shares for basic earnings per share | shares | 9,243,810 | 9,243,810 |  | 9,243,140 |  | 9,242,480
Effect of dilution associated with non-vested shares for share based payment plans | shares | 2,610 | 2,610 |  | 3,290 |  | 3,940
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 | $ 1.13 |  |  | $ 2.04 |  | $ 1.05
Basic earnings per share from discontinued operations | $ / shares | 0.07 |  |  | 0.08 |  |
Diluted earnings per share from continuing operations | $ / shares | 1.13 |  |  | 2.04 |  | $ 1.05
Diluted earnings per share from discontinued operations | $ / shares | $ 0.07 |  |  | $ 0.08 |  |
Allocation of earnings, weighted | 46.11% | 46.11% |  | 46.11% |  | 46.11%
Net controlling interest income allocated from continuing operations | $ | $ 10,403 |  |  | $ 18,842 |  | $ 9,748
Net controlling interest income allocated from discontinued operations | $ | $ 660 |  |  | $ 713 |  |
Series D shares [member] |  |  |  |  |  |
Earnings per share [line items] |  |  |  |  |  |
Weighted average number of shares for basic earnings per share | shares | 8,634,260 | 8,634,260 |  | 8,631,570 |  | 8,628,970
Effect of dilution associated with non-vested shares for share based payment plans | shares | 10,450 | 10,450 |  | 13,140 |  | 15,740
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 | $ 1.41 |  |  | $ 2.55 |  | $ 1.32
Basic earnings per share from discontinued operations | $ / shares | 0.09 |  |  | 0.10 |  |
Diluted earnings per share from continuing operations | $ / shares | 1.41 |  |  | 2.55 |  | $ 1.32
Diluted earnings per share from discontinued operations | $ / shares | $ 0.09 |  |  | $ 0.10 |  |
Allocation of earnings, weighted | 53.89% | 53.89% |  | 53.89% |  | 53.89%
Net controlling interest income allocated from continuing operations | $ | $ 12,157 |  |  | $ 22,021 |  | $ 11,392
Net controlling interest income allocated from discontinued operations | $ | $ 770 |  |  | $ 832 |  |
[1] | Convenience translation to U.S. dollars ($) - See Note 2.2.3
[2] | Revised to reflect the discontinued Philippines operations of Coca-Cola FEMSA - See Note 4.2.1

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