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Leases - Additional information (Detail) - MXN ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement [Line Items]
Weighted average incremental borrowing rate	9.49%	10.18%
Interest expense on lease liabilities	$ 5,075	$ 4,774
Expense relating to leases of low-value assets for which recognition exemption has been used	508	430
Cash Flows	(56,283)	16,869
Financial leases [member]
Statement [Line Items]
Cash Flows	$ 9,810	$ 8,848	$ 26
Retail Stores [member]
Statement [Line Items]
Operating Lease Term	15 years
Office Space [member] | Top of range [member]
Statement [Line Items]
Operating Lease Term	5 years
Office Space [member] | Bottom of range [member]
Statement [Line Items]
Operating Lease Term	3 years
Vehicles, Servers and Equipment [Member] | Top of range [member]
Statement [Line Items]
Operating Lease Term	5 years
Vehicles, Servers and Equipment [Member] | Bottom of range [member]
Statement [Line Items]
Operating Lease Term	3 years
IT Equipment [Member] | Top of range [member]
Statement [Line Items]
Operating Lease Term	1 year
IT Equipment [Member] | Bottom of range [member]
Statement [Line Items]
Operating Lease Term	3 years

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- Definition

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+ References

No definition available.

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- Definition

Operating lease term.

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No definition available.

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- Definition

The amount of the expense relating to leases of low-value assets accounted for applying paragraph 6 of IFRS 16. This expense shall not include the expense relating to short-term leases of low-value assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2020-01-01
-Paragraph 53
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_d&doctype=Standard
-URIDate 2020-01-01

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- Definition

The increase (decrease) in liabilities arising from financing activities resulting from financing cash flows. [Refer: Cash flows from (used in) financing activities; Liabilities arising from financing activities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 7
-IssueDate 2020-01-01
-Paragraph 44B
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_44B_a&doctype=Standard
-URIDate 2020-01-01

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- Definition

The amount of interest expense on lease liabilities. [Refer: Lease liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2020-01-01
-Paragraph 53
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_b&doctype=Standard
-URIDate 2020-01-01

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- Definition

The weighted average lessee's incremental borrowing rate applied to lease liabilities recognised in the statement of financial position at the date of initial application of IFRS 16. The incremental borrowing rate is the rate of interest that a lessee would have to pay to borrow over a similar term, and with a similar security, the funds necessary to obtain an asset of a similar value to the right-of-use asset in a similar economic environment.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2020-01-01
-Paragraph C12
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_C12_a&doctype=Appendix&subtype=C
-URIDate 2020-01-01

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