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Equity (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2020
MXN ($)
item
shares
Dec. 31, 2019
MXN ($)
shares
Disclosure of classes of share capital [line items]    
Capital stock issued 3,578,226,270  
Common stock outstanding 17,891,131,350 17,891,131,350
Fixed capital stock amounts | $ $ 300 $ 300
Variable capital, maximum multiple of fixed capital | item 10  
BD units [member]    
Disclosure of classes of share capital [line items]    
Capital stock issued 2,161,177,770  
Common stock outstanding 10,805,888,850  
Number Of Series Shares For Each Share Unit | item 1  
B units [member]    
Disclosure of classes of share capital [line items]    
Capital stock issued 1,417,048,500  
Common stock outstanding 7,085,242,500  
Minimum percentage for voting 51.00%  
Series B shares [member]    
Disclosure of classes of share capital [line items]    
Number Of Series Shares For Each Share Unit | item 5  
Series D shares [member]    
Disclosure of classes of share capital [line items]    
Maximum percentage for voting right 49.00%  
Series L shares [member]    
Disclosure of classes of share capital [line items]    
Maximum percentage for voting right 25.00%  
Sub series D B shares    
Disclosure of classes of share capital [line items]    
Number Of Series Shares For Each Share Unit | item 2  
Sub series D-L shares [member]    
Disclosure of classes of share capital [line items]    
Maximum percentage for voting right 25.00%  
Number Of Series Shares For Each Share Unit | item 2  
Non cumulative premium [member]    
Disclosure of classes of share capital [line items]    
Dividend payable, premium, as percentage of non-premium dividend 125.00%