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Investments in Associates and Joint Ventures - Schedule of Companys Share of Other comprehensive Income from Equity Investees, Net of Taxes (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2017 MXN ($) | Dec. 31, 2017 USD ($) | [1] | Dec. 31, 2016 MXN ($) | Dec. 31, 2015 MXN ($)
Items that may be reclassified to consolidated net income: |  |  |  |
Total | $ (2,013) | $ (102) | $ (2,228) | $ 282
Items that may not be reclassified to consolidated net income in subsequent periods: |  |  |  |
Remeasurements of the net defined benefit liability | (7) |  | (167) | 144
Equity investments [member] |  |  |  |
Items that may be reclassified to consolidated net income: |  |  |  |
Valuation of the effective portion of derivative financial instruments | 252 |  | 614 | 213
Exchange differences on translating foreign operations | (2,265) |  | (2,842) | 69
Total | (2,013) |  | (2,228) | 282
Items that may not be reclassified to consolidated net income in subsequent periods: |  |  |  |
Remeasurements of the net defined benefit liability | $ 69 |  | $ (1,004) | $ 169
[1] | Convenience translation to U.S. dollars ($) - See Note 2.2.3

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