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Financial Instruments - Disclosure of Outstanding Forward Agreements to Purchase Foreign Currency (Detail) - Forward agreements to purchase foreign currency [member] - MXN ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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0-1 years [member] |  |
Disclosure of Financial Assets and Financial Liabilities [Line Items] |  |
Notional amount | $ 8,447 | $ 5,808
Fair Value Liability | (292) | (65)
Fair Value Asset | 34 | $ 133
1-2 years [member] |  |
Disclosure of Financial Assets and Financial Liabilities [Line Items] |  |
Notional amount | 215 |
Fair Value Asset | 27 |
2-3 years [member] |  |
Disclosure of Financial Assets and Financial Liabilities [Line Items] |  |
Notional amount | 52 |
Fair Value Asset | $ 5 |

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- Definition The fair value of financial assets. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_25&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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