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Other Liabilities, Provisions and Commitments - Summary of Changes in Balance of Provisions Recorded (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of other provisions [line items]      
Balance at beginning of the year $ 13,628    
Balance at end of the year 11,067 $ 13,628  
Legal [member]      
Disclosure of other provisions [line items]      
Balance at beginning of the year 1,049 319 $ 427
Penalties and other charges 121 33  
New contingencies 170 196  
Cancellation and expiration (16) (46) (33)
Contingencies added in business combinations 783 496  
Payments (80) (81)  
Brazil tax amnesty 7    
Effect of foreign currency exchange rates (47) 132 (75)
Effect Venezuela (Note 3.3) (2)    
Balance at end of the year 1,985 1,049 319
Tax [member]      
Disclosure of other provisions [line items]      
Balance at beginning of the year 10,223 1,658 2,198
Penalties and other charges 148 173 21
New contingencies 4 3 84
Cancellation and expiration (98) (106) (205)
Contingencies added in business combinations 861 7,840  
Payments (944) (6) (214)
Brazil tax amnesty (3,069)    
Effect of foreign currency exchange rates (408) 661 (226)
Balance at end of the year 6,717 10,223 1,658
Labor [member]      
Disclosure of other provisions [line items]      
Balance at beginning of the year 2,356 1,340 1,543
Penalties and other charges 56 203 209
New contingencies 115 211 44
Cancellation and expiration (33) (177) (102)
Contingencies added in business combinations   500  
Payments (76) (336) (111)
Effect of foreign currency exchange rates (52) 615 (243)
Effect Venezuela (Note 3.3) (1)    
Balance at end of the year $ 2,365 $ 2,356 $ 1,340