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Income Taxes - Summary of Net Deferred Income Tax Liability (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Changes in deferred tax liability (asset) [abstract]      
Balance at beginning of the year $ (4,776) $ (2,975) $ (1,871)
Deferred tax provision for the year (1,763) (4,381) (1,526)
Change in the statutory rate     16
Acquisition of subsidiaries, see Note 4 (563) 150  
Venezuela effect 261    
Effects in equity:      
Unrealized loss (gain) on derivative financial instruments (160) 324 (19)
Unrealized gain on available for sale securities 0 0 0
Cumulative translation adjustment 221 1,766 350
Remeasurements of the net defined benefit liability (61) 12 32
Inflation adjustment 543 328 43
Balance at end of the year $ (6,298) $ (4,776) $ (2,975)