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Property, Plant and Equipment, Net - Summary of Interest Expense, Interest Income and Net Foreign Exchange Losses and Gains (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [line items]      
Interest expense, interest income and net foreign exchange $ 7,241 $ 4,688 $ 7,285
Net amount in consolidated income statements $ 7,241 $ 4,688 7,216
Property, plant and equipment and intangible assets [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount capitalized     $ 69