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Financial Instruments - Summary of Changes in Consolidated Debt (Detail) - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about financial instruments [abstract] |  |  |
Debt at beginning of year | $ 193,995 | $ 236,238 | $ 229,343
Proceeds from new debt instruments | 43,765 | 93,620 | 48,748
Debt repayments | (53,025) | (131,446) | (89,792)
Foreign currency translation and accretion effects | (1,778) | (4,417) | 47,939
Debt at end of year | $ 182,957 | $ 193,995 | $ 236,238

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