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Financial Instruments - Options to Purchase Foreign Currency (Detail) - Foreign currency option [Member] $ in Millions | 12 Months Ended
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Dec. 31, 2019 MXN ($)
Disclosure of Financial Assets and Financial Liabilities [Line Items] |
Net premium paid | $ 43
0-1 year [member] |
Disclosure of Financial Assets and Financial Liabilities [Line Items] |
Notional amount | 107
Fair Value Asset | $ 2

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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 2020-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_25&doctype=Standard -URIDate 2020-01-01 + Details
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