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Revenues and Construction Contracts - Summary of Net Sales, After Sales and Eliminations Between Related Parties Resulting from Consolidation (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Analysis of income and expense [abstract]      
From the sale of goods associated to CEMEX's main activities $ 246,820 $ 239,696 $ 211,258
From the sale of services 3,313 3,110 2,811
From the sale of other goods and services 7,998 7,139 5,230
Total $ 258,131 $ 249,945 $ 219,299