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Post-Employment and Other Non-current Employee Benefits - Summary of Changes in Balance of Defined Benefit Obligation for Post-Employment and Other Non-Current Employee Benefits (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost $ 285 $ 190 $ 192
Pension and retirement plans [member] | Present value of defined benefit obligation [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Balance at beginning of year 2,915 2,687 2,701
Current service cost 241 145 142
Effect on curtailment   (61) (120)
Interest expense 258 194 185
Actuarial gains or losses 190 (7) (58)
Foreign exchange gain (69) 141 39
Benefits paid (385) (192) (202)
Acquisitions 1,209    
Past service cost 10 8  
Balance at end of year 4,369 2,915 2,687
Seniority premium plan [member] | Present value of defined benefit obligation [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Balance at beginning of year 416 404 393
Current service cost 44 45 45
Effect on curtailment     (9)
Interest expense 29 27 26
Actuarial gains or losses 12 (22) (21)
Benefits paid (40) (38) (30)
Balance at end of year $ 461 416 404
Post employment plan [member] | Present value of defined benefit obligation [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Balance at beginning of year   135 194
Current service cost     5
Certain liability cost     73
Reclasification to certain liability cost   $ (135)  
Foreign exchange gain     (137)
Balance at end of year     $ 135