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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of detailed information about financial instruments [abstract] |  |  |
Debt at beginning of year | $ 236,238 | $ 229,343 | $ 205,834
Proceeds from new debt instruments | 93,620 | 48,748 | 52,764
Debt repayments | (128,411) | (85,798) | (64,237)
Foreign currency translation and inflation effects | (7,452) | 43,945 | 34,982
Debt at end of year | $ 193,995 | $ 236,238 | $ 229,343

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