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Capital Stock and Long-term Retention Plan - Capital Stock (Details)
 12 Months Ended
Dec. 31, 2017
MXN ($)
item
$ / shares
shares
Dec. 31, 2016
MXN ($)
shares
Dec. 31, 2015
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) 362,429,800    
Issued (in shares) 362,429,800    
Repurchased (in shares) (633,600)    
Held by trust (in shares) (19,459,100)    
Outstanding (in shares) 342,337,100 341,268,300 338,468,300
Shares in the form of CPOs, Authorized 301,145,500    
Shares in the form of CPOs, Issued 301,145,500    
Shares in the form of CPOs, Repurchased (633,600)    
Shares in the form of CPOs, Held by trust (13,672,700)    
Shares in the form of CPOs, Outstanding 286,839,200    
Shares not in the form of CPOs, Authorized 61,284,300    
Shares not in the form of CPOs, Issued 61,284,300    
Shares not in the form of CPOs, Held by trust (5,786,400)    
Shares not in the form of CPOs, Outstanding 55,497,900    
Issued capital | $ $ 4,978,126,000 $ 4,978,126,000  
Authorized capital | $ 2,494,410    
Shares repurchased | $ $ 383,808,000    
Series "A" Shares      
Classes of share capital      
Par value of shares | $ / shares $ 0    
Number of shares in each CPO 25    
Authorized (in shares) 123,273,900    
Issued (in shares) 123,273,900    
Repurchased (in shares) (135,300)    
Held by trust (in shares) (6,350,900)    
Outstanding (in shares) 116,787,700 116,283,300 115,409,000
Series "B" Shares      
Classes of share capital      
Par value of shares | $ / shares $ 0    
Number of shares in each CPO 22    
Authorized (in shares) 58,982,900    
Issued (in shares) 58,982,900    
Repurchased (in shares) (119,100)    
Held by trust (in shares) (4,928,000)    
Outstanding (in shares) 53,935,800 53,800,800 53,340,300
CPOs      
Classes of share capital      
Authorized (in shares) 2,573,900    
Issued (in shares) 2,573,900    
Repurchased (in shares) (5,400)    
Held by trust (in shares) (116,900)    
Outstanding (in shares) 2,451,600 2,445,500 2,424,600
Series "D" Shares      
Classes of share capital      
Par value of shares | $ / shares $ 0    
Number of shares in each CPO 35    
Authorized (in shares) 90,086,500    
Issued (in shares) 90,086,500    
Repurchased (in shares) (189,600)    
Held by trust (in shares) (4,090,100)    
Outstanding (in shares) 85,806,800 85,592,100 84,859,500
Series "L" Shares      
Classes of share capital      
Par value of shares | $ / shares $ 0    
Number of shares in each CPO 35    
Authorized (in shares) 90,086,500    
Issued (in shares) 90,086,500    
Repurchased (in shares) (189,600)    
Held by trust (in shares) (4,090,100)    
Outstanding (in shares) 85,806,800 85,592,100 84,859,500