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Basis of Preparation - Summary of Reconciliation Operating Lease Commitments (Detail) - MXN ($) $ in Millions	Jun. 30, 2019	Jan. 01, 2019
Disclosure - Basis of Preparation - Summary of Reconciliation Operating Lease Commitments [Abstract]
Operating lease commitments as of December 31, 2018		$ 50,546
Less: Commitments relating to short-term leases and low-value assets		699
Add: Commitments relating to leases previously classified as finance leases		373
Lease liabilities at the beginning of the period	$ 51,345	$ 50,220

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- Definition

Disclosure - Basis of Preparation - Summary of Reconciliation Operating Lease Commitments [Abstract]

+ References

No definition available.

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- Definition

Operating lease commitment.

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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
-Note Effective 2019-01-01
-Name IFRS
-Number 16
-IssueDate 2018-01-01
-Paragraph 94
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2018-03-01&anchor=para_94&doctype=Standard
-URIDate 2018-03-16

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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
-Note Effective 2019-01-01
-Name IFRS
-Number 16
-IssueDate 2018-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2018-03-01&anchor=para_55&doctype=Standard
-URIDate 2018-03-16

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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
-Note Effective 2019-01-01
-Name IFRS
-Number 16
-IssueDate 2018-01-01
-Paragraph 47
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2018-03-01&anchor=para_47_b&doctype=Standard
-URIDate 2018-03-16

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