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Mergers and Acquisitions - Summary of Pro Forma Financial Data of Historical Financial Statements Related to Business Combinations (Detail) - MXN ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2016
Vonpar [member] |  |
Disclosure of Detailed Information About Business Combination [Line Items] |  |
Total revenues |  | $ 187,139
(Loss) income before taxes |  | 15,819
Net (loss) income |  | $ 11,539
Earnings per share |  | $ 0.61
Aggregated individually immaterial business combinations [member] |  |
Disclosure of Detailed Information About Business Combination [Line Items] |  |
Total revenues | $ 185,737 |
(Loss) income before taxes | 17,763 |
Net (loss) income | $ 15,500 |

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