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Capital Stock and Long-term Retention Plan - Capital Stock (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2019
MXN ($)
item
$ / shares
shares
Dec. 31, 2018
MXN ($)
shares
Dec. 31, 2017
MXN ($)
shares
Apr. 27, 2018
shares
Classes of share capital        
Number of classes of capital stock | item 4      
Number of shares in each CPO 117      
Number of CPOs in each GDS 5      
Authorized (in shares) 357,307,300,000      
Total number of shares issued 357,307,300,000      
Repurchased (in shares) (4,557,200,000) 2,977,600,000   (5,122,600,000)
Held by trust (in shares) (15,505,800,000)      
Outstanding (in shares) 337,244,300,000 338,329,100,000 342,337,100,000  
Shares in the form of CPOs, Authorized and Issued 296,023,000,000      
Shares in the form of CPOs, Repurchased 4,557,200,000     43,800,000
Shares in the form of CPOs, Held by trust 10,386,300,000      
Shares in the form of CPOs, Outstanding 281,079,500,000      
Shares not in the form of CPOs, Authorized and Issued 61,284,300,000      
Shares not in the form of CPOs, Held by trust 5,119,500,000      
Shares not in the form of CPOs, Outstanding 56,164,800,000      
Issued capital | $ $ 4,907,765 $ 4,907,765    
Authorized capital | $ 2,459,154      
Shares repurchased | $ $ 1,385,750 $ 1,541,180 $ 383,808  
Series "A" Shares        
Classes of share capital        
Par value of shares | $ / shares $ 0      
Number of shares in each CPO 25      
Authorized (in shares) 122,179,400,000      
Total number of shares issued 122,179,400,000      
Repurchased (in shares) (973,700,000)      
Held by trust (in shares) (4,981,800,000)      
Outstanding (in shares) 116,223,900,000 116,207,200,000 116,787,700,000  
Series "B" Shares        
Classes of share capital        
Par value of shares | $ / shares $ 0      
Number of shares in each CPO 22      
Authorized (in shares) 58,019,700,000      
Total number of shares issued 58,019,700,000      
Repurchased (in shares) (856,900,000)      
Held by trust (in shares) (4,310,000,000)      
Outstanding (in shares) 52,852,800,000 53,116,100,000 53,935,800,000  
CPOs        
Classes of share capital        
Authorized (in shares) 2,530,100,000      
Total number of shares issued 2,530,100,000      
Repurchased (in shares) (38,900,000) 25,500,000    
Held by trust (in shares) (88,800,000)      
Outstanding (in shares) 2,402,400,000 2,414,400,000 2,451,600,000  
Series "D" Shares        
Classes of share capital        
Par value of shares | $ / shares $ 0      
Number of shares in each CPO 35      
Authorized (in shares) 88,554,100,000      
Total number of shares issued 88,554,100,000      
Repurchased (in shares) (1,363,300,000)      
Held by trust (in shares) (3,107,000,000)      
Outstanding (in shares) 84,083,800,000 84,502,900,000 85,806,800,000  
Series "L" Shares        
Classes of share capital        
Par value of shares | $ / shares $ 0      
Number of shares in each CPO 35      
Authorized (in shares) 88,554,100,000      
Total number of shares issued 88,554,100,000      
Repurchased (in shares) (1,363,300,000)      
Held by trust (in shares) (3,107,000,000)      
Outstanding (in shares) 84,083,800,000 84,502,900,000 85,806,800,000