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Related Parties - Additional Information (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
MXN ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2016
USD ($)
Disclosure of Transactions Between Related Parties [Line Items]            
Amount of compensation of CEMEX board of directors $ 732 $ 38 $ 887 $ 47 $ 802 $ 43
Performance Bonuses [Member]            
Disclosure of Transactions Between Related Parties [Line Items]            
Amount of compensation of CEMEX board of directors 559 29 661 35 595 32
Executive Share-Based Compensation Programs [Member]            
Disclosure of Transactions Between Related Parties [Line Items]            
Amount of compensation of CEMEX board of directors $ 173 $ 9 $ 227 $ 12 $ 207 $ 11