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Non Controlling Interest in Consolidated Subsidiaries - Summary of Non Controlling Interest in Consolidated Subsidiaries (Detail)
$ in Millions, $ in Millions
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Dec. 31, 2014
MXN ($)
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [Line Items]          
Non-controlling interests $ 18,141 $ 924 $ 7,096 $ 3,986 $ 4,401
Mexico [member]          
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [Line Items]          
Non-controlling interests 5,994   5,879 3,342  
Colombia [member]          
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [Line Items]          
Non-controlling interests 23   22 12  
Brazil [member]          
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [Line Items]          
Non-controlling interests 1,224   $ 1,195 $ 632  
Philippinnes [member]          
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [Line Items]          
Non-controlling interests $ 10,900