XML 122 R80.htm IDEA: XBRL DOCUMENT v3.8.0.1
Other Expenses, Net - Summary of Other Expenses (Parenthetical) (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Material income and expense [abstract]        
Impairment losses of fixed assets   $ 984 $ 1,899 $ 1,145
Impairment losses of goodwill   1,920 $ 0 $ 0
Income tax penalty imposed $ 25 $ 491