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Related Parties - Additional Information (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
MXN ($)
Disclosure of Transactions Between Related Parties [Line Items]            
Amount of compensation of CEMEX board of directors $ 47 $ 887 $ 43 $ 802 $ 36 $ 579
Performance Bonuses [Member]            
Disclosure of Transactions Between Related Parties [Line Items]            
Amount of compensation of CEMEX board of directors 35 661 32 595 25 402
Executive Share-Based Compensation Programs [Member]            
Disclosure of Transactions Between Related Parties [Line Items]            
Amount of compensation of CEMEX board of directors $ 12 $ 227 $ 11 $ 207 $ 11 $ 177