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Right-of-use assets and lease debt - Summary of Long Term Debt Maturities (Detail) $ in Thousands, $ in Millions | Dec. 31, 2020 MXN ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 MXN ($)
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Disclosure of detailed information about borrowings [line items] |  |  |
Long-term debt | $ 84,259,336 | $ 4,224 | $ 94,702,022
2022 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term debt | 35,744,268 |  |
2023 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term debt | 12,778,050 |  |
2024 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term debt | 9,606,195 |  |
2025 and Thereafter [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term debt | $ 26,130,823 |  |

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- Definition The amount of non-current lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard -URIDate 2020-01-01 + Details
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