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Basis of Preparation - Summary of Reconciliation Operating Lease Commitments (Detail) - MXN ($) $ in Millions | Dec. 31, 2019 | Jan. 01, 2019
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Disclosure Basis Of Preparation Summary Of Reconciliation Operating Lease Commitments Abstract [Abstract] |  |
Operating lease commitments as of December 31, 2018 |  | $ 82,216
Discounted operating lease commitments |  | 50,827
Less: Commitments relating to short-term leases and low-value assets |  | 699
Add: Commitments relating to leases previously classified as finance leases |  | 92
Lease liabilities and right-of-use asset as of January 1, 2019 | $ 54,679 | $ 50,220

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- Definition Disclosure - Basis of Preparation - Summary of Reconciliation Operating Lease Commitments [Abstract]. + References No definition available. + Details
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- Definition Discounted operating lease liability. + References No definition available. + Details
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- Definition Operating lease commitment. + References No definition available. + Details
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- Definition The amount of the discounted unguaranteed residual value of assets subject to finance leases. Unguaranteed residual value is the portion of the residual value of the underlying asset, the realisation of which by a lessor is not assured or is guaranteed solely by a party related to the lessor. Finance lease is a lease that transfers substantially all the risks and rewards incidental to ownership of an underlying asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 94 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_94&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of the lease commitments for short-term leases accounted for applying paragraph 6 of IFRS 16. Short-term lease is a lease that, at the commencement date, has a lease term of 12 months or less. A lease that contains a purchase option is not a short-term lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard -URIDate 2019-03-27 + Details
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