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Financial Instruments - Summarizes outstanding Cross Currency Swap Agreements (Detail) - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items] |  |
Fair Value (Liability) |  |
Fair Value Asset | $ 9 | $ 1,897
Cross Currency Swaps [member] | Not later than one year [member] | Cash flow hedges [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Maturity Date | 2020 | 2019
Notional Amount | $ 13,788 | $ 4,652
Fair Value (Liability) | (297) | 0
Fair Value Asset | $ 781 | $ 498
Cross Currency Swaps [member] | Later than one year and not later than two years [member] | Cash flow hedges [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Maturity Date | 2021 | 2020
Notional Amount |  | $ 14,400
Fair Value (Liability) | 0 | (79)
Fair Value Asset | $ 0 | $ 969
Cross Currency Swaps [member] | Later than two years and not later than three years [member] | Cash flow hedges [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Maturity Date | 2023 | 2021
Notional Amount | $ 10,742 | $ 4,035
Fair Value (Liability) | (594) | 0
Fair Value Asset | $ 0 | $ 586
Cross Currency Swaps [member] | Later than three years and not later than four years [member] | Cash flow hedges [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Maturity Date | 2027 | 2023
Notional Amount | $ 6,596 | $ 11,219
Fair Value (Liability) | (843) | (390)
Fair Value Asset | $ 0 | $ 135
Cross Currency Swaps [member] | Later than four years and not later than five years [member] | Cash flow hedges [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Maturity Date |  | 2027
Notional Amount |  | $ 6,889
Fair Value (Liability) |  | (42)
Fair Value Asset |  | $ 202

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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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