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Income Taxes - Schedule of Reconciliation Between Actual Income Tax Expense and Amount Computed by Applying Statutory Tax Rate (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]      
Mexican statutory tax rate value 30.00% 30.00% 30.00%
Difference between accounting and tax expenses, net (19.00%) 109.20% 18.70%
Non-taxable sale of equity securities and fixed assets 1.30% (13.40%) (4.60%)
Difference between book and tax inflation (7.10%) 38.10% 19.50%
Differences in the income tax rates in the countries where CEMEX operates (0.90%) (31.90%) (16.00%)
Changes in deferred tax assets (9.60%) (59.80%) (15.60%)
Changes in provisions for uncertain tax positions 0.20% (5.20%) (1.80%)
Others 1.00% (3.00%) 1.00%
Effective consolidated income tax expense rate (4.10%) 64.00% 31.20%
Mexican statutory tax rate $ (382) $ 76 $ 215
Difference between accounting and tax expenses, net 242 277 134
Non-taxable sale of equity securities and fixed assets (17) (34) (33)
Difference between book and tax inflation 90 96 140
Differences in the income tax rates in the countries where CEMEX operates 12 (81) (115)
Changes in deferred tax assets 122 (151) (112)
Changes in provisions for uncertain tax positions (2) (13) (13)
Others (13) (8) 8
Effective consolidated income tax expense rate $ 52 $ 162 $ 224