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Investments in Associates and Joint Ventures - Schedule of Companys Share of Other comprehensive Income from Equity Investees, Net of Taxes (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
 [1]
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Items that may be reclassified to consolidated net income:        
Total $ (2,013) $ (102) $ (2,228) $ 282
Items that may not be reclassified to consolidated net income in subsequent periods:        
Remeasurements of the net defined benefit liability (7)   (167) 144
Equity investments [member]        
Items that may be reclassified to consolidated net income:        
Valuation of the effective portion of derivative financial instruments 252   614 213
Exchange differences on translating foreign operations (2,265)   (2,842) 69
Total (2,013)   (2,228) 282
Items that may not be reclassified to consolidated net income in subsequent periods:        
Remeasurements of the net defined benefit liability $ 69   $ (1,004) $ 169
[1] Convenience translation to U.S. dollars ($) - See Note 2.2.3