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Financial Instruments - Summary of Net Effect of Expired contracts that did not Meet Hedging Criteria for Accounting Purposes (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2018 MXN ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($)
Disclosure of net effect of changes in fair value of derivative financial instruments that did not meet hedging criteria for accounting purposes [line items] |  |  |  |
Market value (loss) gain on financial instruments | $ (314) | $ (16) | $ 246 | $ 51
Currency swap contract [member] |  |  |  |
Disclosure of net effect of changes in fair value of derivative financial instruments that did not meet hedging criteria for accounting purposes [line items] |  |  |  |
Market value (loss) gain on financial instruments | $ (186) |  | (104) | $ (129)
Embedded derivatives [member] |  |  |  |
Disclosure of net effect of changes in fair value of derivative financial instruments that did not meet hedging criteria for accounting purposes [line items] |  |  |  |
Market value (loss) gain on financial instruments |  |  | $ 1 |

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- Definition The gains (losses) on financial assets at fair value through profit or loss. [Refer: Financial assets at fair value through profit or loss] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 20 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_20_a_i&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Disclosure of net effect of changes in fair value of derivative financial instruments that did not meet hedging criteria for accounting purposes. + References No definition available. + Details
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