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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of detailed information about business combination [line items] |  |  |
Total revenues | $ 516,496 | $ 473,420 | $ 462,112
Income before income taxes and share of the profit of equity accounted investees | 33,823 | 34,266 | 39,917
Net income | $ 29,516 | $ 33,521 | $ 37,311
Series B [member] |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Basic net controlling interest income per share | $ 1.11 | $ 1.22 | $ 2.12
Series D [member] |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Basic net controlling interest income per share | $ 1.38 | $ 1.52 | $ 2.65

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