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Financial Income and Other Items, Net - Summary of Financial Income and Other Items (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Material income and expense [abstract]      
Results in the sale of associates and remeasurement of previously held interest before change in control of associates (notes 4.1 and 13.1) $ (204) $ 4,164 $ 0
Financial income 355 338 402
Results from financial instruments, net (notes 13.2 and 16.4) 692 161 113
Foreign exchange results 341 (26) 4,982
Effects of amortized cost on assets and liabilities and others, net (1,088) (1,021) (1,030)
Other financial income (expense), net $ 96 $ 3,616 $ 4,467