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Stockholders' Equity - Summary of Other Equity Reserves (Detail) - MXN ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
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