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Revenue and Construction Contracts - Summary of Revenue, After Sales and Eliminations Between Related Parties Resulting from Consolidation (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Analysis of income and expense [abstract]      
From the sale of goods associated to CEMEX's main activities $ 12,485 $ 12,605 $ 13,018
From the sale of services 145 147 159
From the sale of other goods and services 340 378 354
Total $ 12,970 $ 13,130 $ 13,531