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Debt - Summary of Short Term Debt Maturities (Detail) $ in Thousands, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 MXN ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2018 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |
Short-term debt | $ 96,230,634 | $ 51,745,841 | $ 4,889
Weighted average interest rate | 5.20% | 4.00% |
Senior Notes 1 [member] | Obligations and senior notes [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Short-term debt | $ 67,365,810 | $ 28,994,496 |
Lines of credit [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Short-term debt | 28,852,364 | 22,714,383 |
Finance Lease [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Short-term debt | $ 12,460 | $ 36,962 |

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