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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) - MXN ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash and cash equivalents [abstract]        
Cash and bank accounts $ 9,292 $ 9,104    
Fixed-income securities and other cash equivalents 4,449 2,512    
Consolidated cash and cash equivalents $ 13,741 $ 11,616 $ 15,322 $ 12,589