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Mergers, Acquisitions and Disposals - Unaudited Pro Forma Financial Information (Detail) - MXN ($) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
May 22, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of detailed information about business combination [line items] |  |  |  |
Total revenues |  | $ 508,367 | $ 516,496 | $ 473,420
Income before income taxes and share of the profit of equity accounted investees |  | 20,019 | 33,823 | 34,266
Net income |  | $ 4,464 | $ 29,516 | $ 33,521
Cafe Del Pacifico SAPI De CV Caffenio [member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Business acquisition, percentage of voting equity interests acquired | 10.00% |  |  |
Business acquisition, consideration transferred | $ 370 |  |  |
Percentage of ownership interest of subsidiary | 50.00% |  |  |
Series B [member] | Series of Individually Immaterial Business Acquisitions [Member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Basic net controlling interest income per share |  | $ (0.06) | $ 1.11 | $ 1.22
Series D [member] | Series of Individually Immaterial Business Acquisitions [Member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Basic net controlling interest income per share |  | $ (0.08) | $ 1.38 | $ 1.52

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