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Other Liabilities, Provisions, Contingencies and Commitments - Changes in Balance of Provisions Recorded (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of financial liabilities [line items]      
Balance at beginning of the year $ 16,428    
Balance at end of the year 12,855 $ 16,428  
Indirect taxes [Member]      
Disclosure of financial liabilities [line items]      
Balance at beginning of the year 11,065 1,725 $ 2,271
Penalties and other charges 362 173 21
New contingencies 91 768 84
Contingencies added in business combination 861 7,840  
Cancellation and expiration (796) (106) (205)
Payments (947) (6) (214)
Brazil amnesty adoption (3,321)    
Effects of changes in foreign exchange rates (479) 671 (232)
Balance at end of the year 6,836 11,065 1,725
Labor [Member]      
Disclosure of financial liabilities [line items]      
Balance at beginning of the year 2,578 1,372 1,587
Penalties and other charges 56 203 210
New contingencies 283 397 44
Contingencies added in business combination   500  
Cancellation and expiration (32) (186) (102)
Payments (92) (336) (114)
Effects of changes in foreign exchange rates (69) 628 (253)
Venezuela deconsolidation effect (1)    
Balance at end of the year 2,723 2,578 1,372
Legal [Member]      
Disclosure of financial liabilities [line items]      
Balance at beginning of the year 2,785 318 427
Penalties and other charges 121 34  
New contingencies 186 196  
Contingencies added in business combination 783 2,231  
Cancellation and expiration (16) (46) (33)
Payments (417) (81)  
Brazil amnesty adoption 7    
Effects of changes in foreign exchange rates (151) 133 (76)
Venezuela deconsolidation effect (2)    
Balance at end of the year $ 3,296 $ 2,785 $ 318