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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
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