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Operating Expenses, Depreciation and Amortization - Summary of Consolidated Operating Expense (Parenthetical) (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 MXN ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2015 MXN ($)
Operating Expense [Line items] |  |  |  |  |  |
Administrative expenses |  | $ 21,081 |  | $ 20,750 |  | $ 18,653
Technology and energy departments [member] |  |  |  |  |  |
Operating Expense [Line items] |  |  |  |  |  |
Administrative expenses | $ 38 | $ 754 | $ 38 | $ 712 | $ 41 | $ 660

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