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Income Taxes - Schedule of Changes in Net Deferred Income Tax Asset (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Major components of tax expense (income) [abstract]      
Balance at the beginning of the period $ (9,720) $ (1,016) $ (2,063)
Deferred tax provision for the period (311) (8,218) (5,660)
Deferred tax income net recorded in share of the profit of equity accounted investees 165 (67) 71
Acquisition of subsidiaries (see Note 4) (316) (367) 1,375
Unrealized loss on cash flow hedges (445) (83) 1,008
Exchange differences on translation of foreign operations (1,762) (1,472) 3,260
Remeasurements of the net defined benefit liability 543 131 (479)
Retained earnings of equity accounted investees 54 (38) (224)
Cash flow hedges in foreign investments 310 (540) (618)
Restatement effect of the period and beginning balances associated with hyperinflationary economies 438 1,689 2,314
Disposal of subsidiaries 387    
Deconsolidation of subsidiaries   261  
Balance at the end of the period $ (10,657) $ (9,720) $ (1,016)