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

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