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Non-Controlling Interest in Consolidated Subsidiaries - Summary of Non-Controlling Accumulated Other Comprehensive Loss (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
 [1]
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [Line Items]        
Remeasurements of the net defined benefits liability $ (7)   $ (167) $ 144
Valuation of the effective portion of derivative financial instruments (439) $ (22) 1,732 $ 122
Non-controlling interest [member]        
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [Line Items]        
Exchange differences on translation foreign operation 7,150   (199)  
Remeasurements of the net defined benefits liability (274)   (304)  
Valuation of the effective portion of derivative financial instruments 56   195  
Accumulated other comprehensive loss $ 6,932   $ (308)  
[1] Convenience translation to U.S. dollars ($) - See Note 2.2.3