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Non-Controlling Interest in Consolidated Subsidiaries - Summary of Non-Controlling Interest's Accumulated Other Comprehensive Income (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
MXN ($)
Dec. 31, 2018
USD ($)
 [1]
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2018
USD ($)
 [1]
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [line items]          
Remeasurements of the net defined benefits liability $ 551 $ 28 $ (7) $ (167)  
Valuation of the effective portion of derivative financial instruments (592) $ (30) (439) $ 1,732  
Accumulated other comprehensive income 9,053   18,267   $ 461
Non-controlling interest [member]          
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [line items]          
Exchange differences on translation foreign operation 3,134   7,150    
Remeasurements of the net defined benefits liability (119)   (274)    
Valuation of the effective portion of derivative financial instruments (163)   56    
Accumulated other comprehensive income $ 2,852   $ 6,932    
[1] Convenience translation to U.S. dollars ($) - See Note 2.2.3