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Employee Benefits - Summary of Balances of the Liabilities for Employee Benefits (Detail)
$ in Millions, $ in Millions
Dec. 31, 2018
MXN ($)
Dec. 31, 2018
USD ($)
 [1]
Dec. 31, 2017
MXN ($)
Disclosure of defined benefit plans [line items]      
Total Employee Benefits $ 4,699 $ 239 $ 5,373
Pension and retirement plans [member]      
Disclosure of defined benefit plans [line items]      
Defined benefit obligation 6,189   7,370
Defined benefit obligation funds at fair value (2,501)   (3,131)
Net defined benefit liability 3,688   4,239
Seniority premiums [member]      
Disclosure of defined benefit plans [line items]      
Defined benefit obligation 772   783
Defined benefit obligation funds at fair value (111)   (109)
Net defined benefit liability 661   674
Post retirement medical services [member]      
Disclosure of defined benefit plans [line items]      
Defined benefit obligation 418   524
Defined benefit obligation funds at fair value (68)   (64)
Net defined benefit liability $ 350   $ 460
[1] Convenience translation to U.S. dollars ($) - See Note 2.2.3