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Income Taxes - Schedule of Reconciliation Between Actual Income Tax Expense and Amount Computed by Applying Statutory Tax Rate (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]      
Mexican statutory tax rate value (30.00%) (30.00%) (30.00%)
Non-taxable dividend income 0.80% 0.10% 0.20%
Difference between accounting and tax expenses, net (15.40%) (20.80%) 82.30%
Unrecognized effects during the year related to applicable tax consolidation regimes (0.70%) 0.90% (3.60%)
Non-taxable sale of equity securities and fixed assets 4.60% 15.00% 3.70%
Difference between book and tax inflation (19.50%) (31.10%) (11.00%)
Differences in the income tax rates in the countries where CEMEX operates 16.00% 21.80% 11.00%
Changes in deferred tax assets 14.70% 39.60% (69.90%)
Changes in provisions for uncertain tax positions 1.80% (0.40%) 0.70%
Others (1.10%) 1.10% (1.10%)
Effective consolidated tax rate (28.80%) (3.80%) (17.70%)
Mexican statutory tax rate $ (4,653) $ (4,110) $ (5,285)
Non-taxable dividend income 124 14 32
Difference between accounting and tax expenses, net (2,394) (2,855) 14,507
Unrecognized effects during the year related to applicable tax consolidation regimes (109) 123 (632)
Non-taxable sale of equity securities and fixed assets 713 2,049 650
Difference between book and tax inflation (3,024) (4,261) (1,932)
Differences in the income tax rates in the countries where CEMEX operates 2,482 2,991 1,932
Changes in deferred tax assets 2,286 5,433 (12,320)
Changes in provisions for uncertain tax positions 279 (55) 123
Others (171) 151 (200)
Income tax expense $ (4,467) $ (520) $ (3,125)