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Mergers and Acquisitions - Summary of Pro Forma Financial Data of Historical Financial Statements Related to Business Combinations (Detail) - Aggregated Individually Immaterial Business Combinations $ in Millions | 12 Months Ended
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Dec. 31, 2018 MXN ($)
Disclosure of Detailed Information About Business Combination [Line Items] |
Total revenues | $ 185,737
Income before taxes | 17,763
Net income | $ 15,500

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