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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
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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

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