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Mergers, Acquisitions and Disposals - Unaudited Pro Forma Financial Information (Detail) - MXN ($)
$ / shares in Units, $ in Millions
12 Months Ended
May 22, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about business combination [line items]        
Total revenues   $ 508,367 $ 516,496 $ 473,420
Income before income taxes and share of the profit of equity accounted investees   20,019 33,823 34,266
Net income   $ 4,464 $ 29,516 $ 33,521
Cafe Del Pacifico SAPI De CV Caffenio [member]        
Disclosure of detailed information about business combination [line items]        
Business acquisition, percentage of voting equity interests acquired 10.00%      
Business acquisition, consideration transferred $ 370      
Percentage of ownership interest of subsidiary 50.00%      
Series B [member] | Series of Individually Immaterial Business Acquisitions [Member]        
Disclosure of detailed information about business combination [line items]        
Basic net controlling interest income per share   $ (0.06) $ 1.11 $ 1.22
Series D [member] | Series of Individually Immaterial Business Acquisitions [Member]        
Disclosure of detailed information about business combination [line items]        
Basic net controlling interest income per share   $ (0.08) $ 1.38 $ 1.52