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Financial Instruments - Outstanding Forward Agreements to Purchase Foreign Currency (Detail) - MXN ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items] |  |
Fair Value Asset | $ 1,897,000,000 | $ 955,000,000
Forward agreements to purchase foreign currency [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Maturity Date | 2019 | 2018
Notional Amount | $ 4,768,000,000 | $ 6,882,000,000
Fair Value (Liability) | (66,000,000) | (22,000,000)
Fair Value Asset | $ 109,000,000 | $ 190,000,000
Options to purchase foreign currency [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Maturity Date | 2019 | 2018
Notional Amount | $ 1,734,000,000 | $ 266,000,000
Fair Value (Liability) | (33,000,000) | (5,000,000)
Fair Value Asset | $ 57,000,000 | $ 17,000,000

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- Definition The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
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Period Type: | instant

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- Definition The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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Period Type: | instant

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- Definition Derivative instrument maturity date. + References No definition available. + Details
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- Details
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- Details
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