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Financial Instruments - Summary of Outstanding Collar Options to Purchase Foreign Currency (Detail) - Less than 1 year [member] - Options to purchase foreign currency [Member] - MXN ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of Financial Assets and Financial Liabilities [Line Items] |  |
Notional amount | $ 1,734 | $ 266
Fair value Liability | (33) | (5)
Fair Value Asset | $ 57 | $ 17

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