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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, 2017
Dec. 31, 2016
Dec. 31, 2015
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) $ 4,164 $ 0 $ 0
Financial income 338 402 318
Results from financial instruments, net (notes 13.2 and 16.4) 161 113 (2,729)
Foreign exchange results (26) 5,004 1,970
Effects of NPV on assets and liabilities and others, net (1,021) (1,030) (892)
Other financial income (expense), net $ 3,616 $ 4,489 $ (1,333)