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Leases - Schedule of Company's right-of-use asset (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) | [1] | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2017 MXN ($)
Presentation of leases for lessee [abstract] |  |  |  |  |
As of January 1, 2019 |  | $ 0 |  |  |
Additions |  | 215 |  |  |
Disposals |  | (36) |  |  |
Depreciation | $ (29) | (555) | [2] | $ 0 | $ 0
Hyperinflationary economies effect |  | 20 |  |  |
Indexation effect |  | 15 |  |  |
Effects of changes in foreign exchange rates |  | (74) |  |  |
Right-of-use assets, net as of December 31, 2019 | $ 73 | $ 1,382 | [2] | $ 0 |
[1] | Convenience translation to U.S. dollars ($) – See Note 2.2.3
[2] | The Company initially adopted IFRS 16 on January 1, 2019 using the modified retrospective approach under which the comparative information is not restated. – See Note 2.4.1

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- Definition The amount of additions to right-of-use assets. [Refer: Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 53 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_h&doctype=Standard -URIDate 2019-03-27 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 53 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_a&doctype=Standard -URIDate 2019-03-27 + Details
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Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
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- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_j&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Disposal of right of use assets. + References No definition available. + Details
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Balance Type: | credit
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- Definition Effects of change in foreign exchange rates,right of use assets. + References No definition available. + Details
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- Definition Right of use asset hyper inflationary economies effect. + References No definition available. + Details
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Balance Type: | debit
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- Definition Right of use asset indexation effect. + References No definition available. + Details
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