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Stockholders' Equity - Summary of Other Equity Reserves (Detail) - MXN ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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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) | $ 21,288 | $ 31,293
Cumulative actuarial losses | (10,931) | (10,934)
Effects associated with CEMEX's convertible securities | 3,427 | 4,761
Treasury shares held by subsidiaries | (301) | (327)
Other equity reserves | $ 13,483 | $ 24,793

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