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Capital Stock and Long-term Retention Plan - Capital Stock (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
MXN ($)
item
$ / shares
shares
Dec. 31, 2019
MXN ($)
shares
Dec. 31, 2018
MXN ($)
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) (5,173,200,000)    
Held by trust (in shares) (26,141,600,000)    
Outstanding (in shares) 325,992,500,000 337,244,300,000 338,329,100,000
Shares in the form of CPOs, Authorized and Issued 296,023,000,000    
Shares in the form of CPOs, Repurchased 5,173,200,000    
Shares in the form of CPOs, Held by trust 20,004,200,000    
Shares in the form of CPOs, Outstanding 270,845,600,000    
Shares not in the form of CPOs, Authorized and Issued 61,284,300,000    
Shares not in the form of CPOs, Held by trust 6,137,400,000    
Shares not in the form of CPOs, Outstanding 55,146,900,000    
Issued capital | $ $ 4,907,765 $ 4,907,765  
Authorized capital | $ 2,459,154    
Shares repurchased | $ $ 195,597 $ 1,385,750 $ 1,541,180
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) (1,105,400,000)    
Held by trust (in shares) (8,054,800,000)    
Outstanding (in shares) 113,019,200,000 116,223,900,000 116,207,200,000
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) (972,800,000)    
Held by trust (in shares) (6,118,400,000)    
Outstanding (in shares) 50,928,500,000 52,852,800,000 53,116,100,000
CPOs      
Classes of share capital      
Authorized (in shares) 2,530,100,000    
Total number of shares issued 2,530,100,000    
Repurchased (in shares) (44,200,000)    
Held by trust (in shares) (171,000,000)    
Outstanding (in shares) 2,314,900,000 2,402,400,000 2,414,400,000
Shares in the form of CPOs, Repurchased 616,000,000 (4,557,200,000)  
Shares repurchased | $ $ 5,300 $ 38,900  
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) (1,547,500,000)    
Held by trust (in shares) (5,984,200,000)    
Outstanding (in shares) 81,022,400,000 84,083,800,000 84,502,900,000
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) (1,547,500,000)    
Held by trust (in shares) (5,984,200,000)    
Outstanding (in shares) 81,022,400,000 84,083,800,000 84,502,900,000