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Stockholders' Equity - Summary of Other Equity Reserves (Detail) - MXN ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2016 | Dec. 31, 2017
Disclosure of reserves within equity [abstract] |  |  |
Cumulative translation effect, net of effects from perpetual debentures and deferred income taxes recognized directly in equity (notes 19.2 and 20.4) | $ 17,683 | $ 21,288 |
Cumulative actuarial losses | (7,527) | (10,931) |
Treasury shares repurchased under share repurchase program (note 20.1) | (1,520) | 0 |
Effects associated with the Parent Company's convertible securities | 3,427 | 3,427 |
Treasury shares held by subsidiaries | (194) | (301) |
Other equity reserves | $ 11,869 | $ 13,483 | $ 13,483

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