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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 Operating lease term. + References No definition available. + Details
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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 + Details
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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 + Details
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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 + Details
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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 + Details
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