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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about property, plant and equipment [line items]      
Interest expense, interest income and net foreign exchange $ 4,602 $ 7,285 $ 8,031
Net amount in consolidated income statements $ 4,602 7,216 7,946
Property, plant and equipment and intangible assets [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Amount capitalized   $ 69 $ 85