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Earnings per Share - Summary of Basic and Diluted Earnings per Share (Detail)
shares in Millions, $ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2020
MXN ($)
shares
Dec. 31, 2019
MXN ($)
shares
Dec. 31, 2018
MXN ($)
shares
Earnings per share- Equity holders of the parent (U.S. dollars and Mexican pesos):        
Consolidated net income $ 521 [1] $ 10,368 $ 12,630 [2],[3] $ 15,070
Equity holders of the parent- continuing operations 518 [1] 10,307 12,101 [3] 10,936
Equity holders of the parent- discontinued operations $ 0 [1] 0 0 [3] 2,975
"A" shares        
Earnings per share- Equity holders of the parent (U.S. dollars and Mexican pesos):        
Consolidated net income   4,896 5,965 7,116
Equity holders of the parent- continuing operations   $ 4,868 $ 5,715  
Consolidated net income attributable to equity holders of the parent- continuing operations       5,164
Equity holders of the parent- discontinued operations       $ 1,405
Weighted average number of shares for basic earnings per share (millions of shares) | shares 7,937 7,937 7,937 7,937
"D" shares        
Earnings per share- Equity holders of the parent (U.S. dollars and Mexican pesos):        
Consolidated net income   $ 2,880 $ 3,508 $ 4,186
Equity holders of the parent- continuing operations   $ 2,863 $ 3,360  
Consolidated net income attributable to equity holders of the parent- continuing operations       3,038
Equity holders of the parent- discontinued operations       $ 826
Weighted average number of shares for basic earnings per share (millions of shares) | shares 4,668 4,668 4,668 4,668
"B" shares        
Earnings per share- Equity holders of the parent (U.S. dollars and Mexican pesos):        
Consolidated net income   $ 972 $ 1,184 $ 1,413
Equity holders of the parent- continuing operations   $ 966 $ 1,135  
Consolidated net income attributable to equity holders of the parent- continuing operations       1,025
Equity holders of the parent- discontinued operations       $ 279
Weighted average number of shares for basic earnings per share (millions of shares) | shares 1,576 1,576 1,576 1,576
Series L shares, without par value        
Earnings per share- Equity holders of the parent (U.S. dollars and Mexican pesos):        
Consolidated net income   $ 1,620 $ 1,973 $ 2,355
Equity holders of the parent- continuing operations   $ 1,610 $ 1,891  
Consolidated net income attributable to equity holders of the parent- continuing operations       1,709
Equity holders of the parent- discontinued operations       $ 465
Weighted average number of shares for basic earnings per share (millions of shares) | shares 2,626 2,626 2,626 2,626
[1] Convenience translation to U.S. dollars ($) – See Note 2.2.3
[2] The Company initially adopted IFRS 16 at January 1, 2019 using the modified retrospective approach under which the comparative information is not restated. – See Note 3.18
[3] The Company initially adopted IFRS 16 on January 1, 2019 using the modified retrospective approach under which the comparative information is not restated – See note 3.18