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Mergers, Acquisitions and Disposals - Summary of Unaudited Pro Forma Financial Information (Detail) - MXN ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about business combination [line items] |  |  |
Total revenues | $ 473,420 | $ 462,112 | $ 410,831
Income before income taxes and share of the profit of equity accounted investees | 34,266 | 39,917 | 29,950
Net income | $ 33,521 | $ 37,311 | $ 28,110
Series B 1 [member] |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Basic net controlling interest income per share | $ 1.22 | $ 2.12 | $ 1.08
Series D [member] |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Basic net controlling interest income per share | $ 1.52 | $ 2.65 | $ 1.35

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