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Post-Employment and Other Non-current Employee Benefits - Balances of Liabilities for Post-Employment and Other Non-Current Employee Benefits (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2017
USD ($)
Disclosure of net defined benefit liability (asset) [line items]      
Total post-employment and other non-current employee benefits $ 3,029 $ 2,319 $ 154
Pension and retirement plans [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Vested benefit obligation 389 656  
Non-vested benefit obligation 1,398 1,318  
Accumulated benefit obligation 1,787 1,974  
Excess of projected defined benefit obligation over accumulated benefit obligation 2,582 941  
Defined benefit obligation 4,369 2,915  
Pension plan funds at fair value (1,692) (910)  
Net defined benefit liability 2,677 2,005  
Seniority premiums [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Vested benefit obligation 36 18  
Non-vested benefit obligation 267 175  
Accumulated benefit obligation 303 193  
Excess of projected defined benefit obligation over accumulated benefit obligation 158 223  
Defined benefit obligation 461 416  
Pension plan funds at fair value (109) (102)  
Net defined benefit liability $ 352 $ 314