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Debt - Summary of Short Term Debt Maturities (Detail) $ in Thousands, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 MXN ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2020 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |
Short-term debt | $ 148,083,184 | $ 129,172,033 | $ 7,423
Weighted average interest rate | 2.23% | 3.31% |
Senior Notes 1 [member] | Obligations and senior notes [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Short-term debt | $ 95,007,014 | $ 88,438,286 |
Lines of credit [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Short-term debt | 53,062,260 | 40,722,004 |
Finance Lease [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Short-term debt | $ 13,910 | $ 11,743 |

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