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Mergers and Acquisitions - Summary of Selected Income Statement Information Related to Business Acquisition (Detail) - MXN ($) $ in Millions | 1 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2018
Vonpar [member] |  |
Disclosure of Detailed Information About Business Combination [Line Items] |  |
Total revenue | $ 1,628 |
Income before taxes | 380 |
Net income | $ 252 |
Aggregated individually immaterial business combinations [member] |  |
Disclosure of Detailed Information About Business Combination [Line Items] |  |
Total revenue |  | $ 4,628
Income before taxes |  | 496
Net income |  | $ 413

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