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Employee Benefits - Summary of Balances of the Liabilities for Employee Benefits (Detail)
$ in Millions, $ in Millions
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
 [1]
Dec. 31, 2016
MXN ($)
Disclosure of defined benefit plans [line items]      
Total employee benefits $ 5,373 $ 274 $ 4,447
Pension and retirement plans [member]      
Disclosure of defined benefit plans [line items]      
Defined benefit obligation 7,370   5,702
Defined benefit obligation funds at fair value (3,131)   (2,216)
Net defined benefit liability 4,239   3,486
Seniority premiums [member]      
Disclosure of defined benefit plans [line items]      
Defined benefit obligation 783   663
Defined benefit obligation funds at fair value (109)   (102)
Net defined benefit liability 674   561
Postretirement medical services [member]      
Disclosure of defined benefit plans [line items]      
Defined benefit obligation 524   460
Defined benefit obligation funds at fair value (64)   (60)
Net defined benefit liability $ 460   $ 400
[1] Convenience translation to U.S. dollars ($) - See Note 2.2.3