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Financial Instruments - Summary of Fair Value of Derivative Financial Instruments at Fair Value Hierarchy (Detail) - MXN ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Derivative instruments | $ 794 | $ 1,900
Investments available-for-sale | 275 | 491
Investments held for trading | 77 | 157
Total derivative financial assets | 1,146 | 2,548
Liabilities measured at fair value Derivative instruments | 402 | 818
Level 1 [Member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Derivative instruments | 0 | 0
Investments available-for-sale | 275 | 491
Investments held for trading | 0 | 0
Total derivative financial assets | 275 | 491
Liabilities measured at fair value Derivative instruments | 0 | 0
Level 2 [Member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Derivative instruments | 794 | 1,900
Investments available-for-sale | 0 | 0
Investments held for trading | 77 | 157
Total derivative financial assets | 871 | 2,057
Liabilities measured at fair value Derivative instruments | 402 | 818
Level 3 [Member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Derivative instruments | 0 | 0
Investments available-for-sale | 0 | 0
Investments held for trading | 0 | 0
Total derivative financial assets | 0 | 0
Liabilities measured at fair value Derivative instruments | $ 0 | $ 0

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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 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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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 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of non-current derivative financial assets. [Refer: Derivative financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of non-current financial assets available-for-sale. [Refer: Financial assets available-for-sale; Non-current financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 8 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_8_d&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Definition The amount of non-current held-to-maturity investments. [Refer: Held-to-maturity investments] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 8 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_8_b&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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