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Contingencies - Additional Information (Detail)
€ in Millions, $ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Dec. 11, 2017
USD ($)
Dec. 11, 2017
MXN ($)
Jun. 30, 2012
USD ($)
Jun. 30, 2012
MXN ($)
Dec. 31, 2017
USD ($)
T
Dec. 31, 2017
MXN ($)
T
Dec. 31, 2012
USD ($)
Employees
Dec. 31, 2012
MXN ($)
Employees
Dec. 31, 2011
Employees
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
Sep. 30, 2016
USD ($)
Sep. 30, 2016
MXN ($)
Sep. 30, 2016
EUR (€)
Dec. 31, 2015
Jun. 30, 2010
USD ($)
Jun. 30, 2010
MXN ($)
Disclosure of Commitments and Contingencies [Line Items]                                  
Accrued environmental remediation liabilities                               $ 100 $ 1,976
Fine payable by S.L.U.                       $ 7 $ 138 € 6      
Development levy on clay         $ 18         $ 357              
Number of former employees | Employees             25 25 25                
Amount of damages and interest identified             $ 66 $ 1,297                  
Damages sought value     $ 80 $ 1,564                          
Euro [member]                                  
Disclosure of Commitments and Contingencies [Line Items]                                  
Official closing exchange rates         23.5866         23.5866 21.7945       18.7181    
Pounds [member]                                  
Disclosure of Commitments and Contingencies [Line Items]                                  
Official closing exchange rates         26.5361         26.5361 25.5361       25.4130    
Colombian Peso [member]                                  
Disclosure of Commitments and Contingencies [Line Items]                                  
Official closing exchange rates         0.0066         0.0066 0.0069       0.0055    
United Kingdom [member]                                  
Disclosure of Commitments and Contingencies [Line Items]                                  
Accrued environmental remediation liabilities         $ 178         $ 3,493              
Environmental remediation, description         Expenditure was assessed and quantified over the period in which the sites have the potential to cause environmental harm, which was accepted by the regulator as being up to 60 years from the date of closure Expenditure was assessed and quantified over the period in which the sites have the potential to cause environmental harm, which was accepted by the regulator as being up to 60 years from the date of closure                      
United States [member]                                  
Disclosure of Commitments and Contingencies [Line Items]                                  
Accrued environmental remediation liabilities         $ 30         $ 586              
Superintendencia de Industria y Comercio [member]                                  
Disclosure of Commitments and Contingencies [Line Items]                                  
Fine imposed $ 25 $ 491                              
CEMEX Polska [Member]                                  
Disclosure of Commitments and Contingencies [Line Items]                                  
Fine imposed         $ 27 $ 531                      
Parent [member] | Polish Zloty [Member]                                  
Disclosure of Commitments and Contingencies [Line Items]                                  
Official closing exchange rates         3,470,000         3,470,000              
Parent [member] | Euro [member]                                  
Disclosure of Commitments and Contingencies [Line Items]                                  
Official closing exchange rates         830,000         830,000              
Parent [member] | Pounds [member]                                  
Disclosure of Commitments and Contingencies [Line Items]                                  
Official closing exchange rates         740,000         740,000              
Parent [member] | Colombian Peso [member]                                  
Disclosure of Commitments and Contingencies [Line Items]                                  
Official closing exchange rates         2,984,000,000         2,984,000,000              
Parent [member] | Israelite Shekel [Member]                                  
Disclosure of Commitments and Contingencies [Line Items]                                  
Official closing exchange rates         3,470,000         3,470,000              
Top of range [member]                                  
Disclosure of Commitments and Contingencies [Line Items]                                  
Incrementing production up on environmental permit needs modifications | T         950,000 950,000