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Income Taxes - Summary of Income Tax Revenue Expense (Detail) - MXN ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Major components of tax expense (income) [abstract]      
Current income taxes $ (3,458) $ (3,456) $ 6,121
Deferred income taxes 2,938 331 (8,489)
Income tax expense $ (520) $ (3,125) $ (2,368)