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Equity Accounted Investees - 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, 2018 MXN ($) | Dec. 31, 2018 USD ($) | [1] | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($)
Items that may be reclassified to consolidated net income: |  |  |  |
Total | $ (360) | $ (18) | $ (2,013) | $ (2,228)
Items that may not be reclassified to consolidated net income in subsequent periods: |  |  |  |
Remeasurements of the net defined benefit liability | 551 | $ 28 | (7) | (167)
Equity investments [member] |  |  |  |
Items that may be reclassified to consolidated net income: |  |  |  |
Valuation of the effective portion of derivative financial instruments | (355) |  | 252 | 614
Exchange differences on translating foreign operations | (6) |  | (2,265) | (2,842)
Total | (361) |  | (2,013) | (2,228)
Items that may not be reclassified to consolidated net income in subsequent periods: |  |  |  |
Remeasurements of the net defined benefit liability | $ 597 |  | $ 69 | $ (1,004)
[1] | Convenience translation to U.S. dollars ($) - See Note 2.2.3

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