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Financial Instruments - Summary of Fair Value of Derivative Financial Instruments at Fair Value Hierarchy (Detail) - MXN ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Derivative instruments | $ 297 | $ 794
Investments in strategic equity securities | 217 | 275
Other investments at fair value through earnings | 428 | 441
Total derivative financial assets | 942 | 1,510
Liabilities measured at fair value Derivative instruments | 406 | 402
Level 1 [Member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Derivative instruments | 0 | 0
Investments in strategic equity securities | 217 | 275
Other investments at fair value through earnings | 0 | 0
Total derivative financial assets | 217 | 275
Liabilities measured at fair value Derivative instruments | 0 | 0
Level 2 [Member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Derivative instruments | 297 | 794
Investments in strategic equity securities | 0 | 0
Other investments at fair value through earnings | 428 | 441
Total derivative financial assets | 725 | 1,235
Liabilities measured at fair value Derivative instruments | 406 | 402
Level 3 [Member] |  |
Disclosure Of Financial Assets and Financial Liabilities [line items] |  |
Derivative instruments | 0 | 0
Investments in strategic equity securities | 0 | 0
Other investments at fair value through earnings | 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 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 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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