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Income Taxes - Summary of Major Components of Income Tax Expense (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Current tax expense:        
Current year $ 6,317   $ 8,574 $ 6,060
Deferred tax expense:        
Origination and reversal of temporary differences (1,698)   (2,812) 721
(Benefit) utilization of tax losses recognized (65)   (1,834) (2,230)
Total deferred tax (benefit) (1,763)   (4,646) (1,509)
Total income tax expense in consolidated net income 4,554 $ 232 3,928 4,551
Mexico [member]        
Current tax expense:        
Current year 3,874   4,035 3,887
Deferred tax expense:        
Origination and reversal of temporary differences (1,798)   (1,117) 427
(Benefit) utilization of tax losses recognized 179   (1,285) (997)
Total deferred tax (benefit) (1,619)   (2,402) (570)
Total income tax expense in consolidated net income 2,255   1,633 3,317
Foreign [member]        
Current tax expense:        
Current year 2,443   4,539 2,173
Deferred tax expense:        
Origination and reversal of temporary differences 100   (1,695) 294
(Benefit) utilization of tax losses recognized (244)   (549) (1,233)
Total deferred tax (benefit) (144)   (2,244) (939)
Total income tax expense in consolidated net income $ 2,299   $ 2,295 $ 1,234