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Equity Accounted Investees - Schedule of Companys Share of Other comprehensive Income from Equity Investees, Net of Taxes (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
MXN ($)
Dec. 31, 2018
USD ($)
 [1]
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Items that may be reclassified to consolidated net income:        
Total $ (360) $ (18) $ (2,013) $ (2,228)
Items that may not be reclassified to consolidated net income in subsequent periods:        
Remeasurements of the net defined benefit liability 551 $ 28 (7) (167)
Equity investments [member]        
Items that may be reclassified to consolidated net income:        
Valuation of the effective portion of derivative financial instruments (355)   252 614
Exchange differences on translating foreign operations (6)   (2,265) (2,842)
Total (361)   (2,013) (2,228)
Items that may not be reclassified to consolidated net income in subsequent periods:        
Remeasurements of the net defined benefit liability $ 597   $ 69 $ (1,004)
[1] Convenience translation to U.S. dollars ($) - See Note 2.2.3