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Financial Instruments - Outstanding Forward Agreements to Purchase Foreign Currency (Detail) - MXN ($) | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets | $ 2,524,000,000 | $ 9,000,000
Forward agreements to purchase foreign currency | 2021 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional Amount | 7,130,000,000 |
Derivative financial instruments liability | (843,000,000) |
Derivative financial assets | $ 4,000,000 |
Forward agreements to purchase foreign currency | 2020 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional Amount |  | 7,692,000,000
Derivative financial instruments liability |  | (315,000,000)
Derivative financial assets |  | 20,000,000
Option to purchase foreign currency |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional Amount |  | 107,000,000
Derivative financial instruments liability |  | 0
Derivative financial assets |  | $ 2,000,000

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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 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&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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