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Non Controlling Interest in Consolidated Subsidiaries - Summary of Non Controlling Interest (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Disclosure Of Non Controlling Interests [Abstract]        
Balance at beginning of the year $ 7,096   $ 3,986 $ 4,401
Efects of business combination 11,072      
Net income of non controlling interest 1,148 $ 58 457 94
Exchange differences on translation of foreign operations (1,138)   1,845 (554)
Remeasurements of the net defined employee benefit liability 38     6
Valuation of the effective portion of derivative financial instruments, net of taxes (74)   51 50
Increase in shares of non-controlling interest     826  
Dividends paid (1)   (69) (11)
Balance at end of the year $ 18,141 $ 924 $ 7,096 $ 3,986