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Employee Benefits - Summary of Changes in the Balance of the Defined Benefit Obligation for Post-employment (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pension and retirement plans [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Initial balance $ 7,370    
Ending balance 6,189 $ 7,370  
Pension and retirement plans [member] | Present value of defined benefit obligation [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Initial balance 7,370 5,702 $ 5,308
Current service cost 318 341 245
Past service cost   10 45
Interest expense 484 491 369
Effect on curtailment   (2) (61)
Curtailment / Settlement (5)    
Remeasurements of the net defined benefit obligation (740) 263 (67)
Foreign exchange loss (gain) (86) (79) 150
Benefits paid (450) (550) (287)
(Derecognition) acquisitions (702) 1,194  
Ending balance 6,189 7,370 5,702
Seniority premiums [member] | Present value of defined benefit obligation [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Initial balance 783 663 610
Current service cost 125 106 93
Interest expense 57 49 41
Curtailment / Settlement (8) (1)  
Remeasurements of the net defined benefit obligation (115) 28 (43)
Benefits paid (77) (68) (55)
Acquisitions 7 6 17
Ending balance 772 783 663
Post retirement medical services [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Initial balance 524    
Ending balance 418 524  
Post retirement medical services [member] | Present value of defined benefit obligation [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Initial balance 524 460 404
Current service cost 25 24 22
Interest expense 39 34 27
Curtailment / Settlement (1)    
Remeasurements of the net defined benefit obligation (143) 32 30
Benefits paid (26) (26) (23)
Ending balance 418 524 460
Post-employment [member] | Present value of defined benefit obligation [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Initial balance 0 0 135
Reclassification to certain liability cost 0 0 (135)
Ending balance $ 0 $ 0 $ 0