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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, 2019 MXN ($) $ / shares shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 MXN ($) $ / shares shares | Dec. 31, 2017 MXN ($) $ / shares shares
Earnings per share [line items] |  |  |  |  |  |  |
Net controlling interest income allocated from continuing operations | $ 20,699 | [1] | $ 1,098 | [1],[2] | $ 22,560 | $ 40,864 | [3]
Net controlling interest income allocated from discontinued operations | $ |  |  |  |  | $ 1,430 | $ 1,545 | [3]
Series B shares [member] |  |  |  |  |  |  |
Earnings per share [line items] |  |  |  |  |  |  |
Weighted average number of shares for basic earnings per share | shares | 9,244,160 |  | 9,244,160 |  | 9,243,810 | 9,243,140 |
Effect of dilution associated with non-vested shares for share based payment plans | shares | 2,260 |  | 2,260 |  | 2,610 | 3,290 |
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 | $ 1.03 |  |  |  | $ 1.13 | $ 2.04 |
Basic earnings per share from discontinued operations | $ / shares |  |  |  |  | 0.07 | 0.08 |
Diluted earnings per share from continuing operations | $ / shares | $ 1.03 |  |  |  | 1.13 | 2.04 |
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 | $ | $ 9,545 |  |  |  | $ 10,403 | $ 18,842 |
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 | 8,635,650 |  | 8,635,650 |  | 8,634,260 | 8,631,570 |
Effect of dilution associated with non-vested shares for share based payment plans | shares | 9,060 |  | 9,060 |  | 10,450 | 13,140 |
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 | $ 1.29 |  |  |  | $ 1.41 | $ 2.55 |
Basic earnings per share from discontinued operations | $ / shares |  |  |  |  | 0.09 | 0.10 |
Diluted earnings per share from continuing operations | $ / shares | $ 1.29 |  |  |  | 1.41 | 2.55 |
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 | $ | $ 11,154 |  |  |  | $ 12,157 | $ 22,021 |
Net controlling interest income allocated from discontinued operations | $ |  |  |  |  | $ 770 | $ 832 |
[1] | The Company initially adopted IFRS 16 at January 1st, 2019 using the modified retrospectively approach under which the comparative information is not restated. – See Note 2.4.1
[2] | Convenience translation to U.S. dollars ($) – See Note 2.2.3
[3] | Revised to reflect the discontinued operations of Coca-Cola FEMSA Philippines – See Note 4.2.1

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