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Commitments - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2017
USD ($)
T
Apr. 30, 2016
MWh
Jul. 30, 2012
Feb. 28, 2010
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
MXN ($)
Disclosure of Commitments and Contingencies [Line Items]                  
Guaranteed loans of certain subsidiaries $ 1,506,000,000       $ 29,601,000,000 $ 2,887,000,000 $ 59,819,000,000    
Liabilities secured by property, machinery and equipment         0   0    
Self-insured health care benefits 64,000,000       1,258,000,000 $ 69,000,000 $ 1,430,000,000 $ 69,000,000 $ 1,189,000,000
Bottom of range [member]                  
Disclosure of Commitments and Contingencies [Line Items]                  
Stop-loss limits value under medical assistance 23,000                
Bottom of range [member] | Employees [Member]                  
Disclosure of Commitments and Contingencies [Line Items]                  
Stop-loss limits value under medical assistance $ 100,000                
Top of range [member]                  
Disclosure of Commitments and Contingencies [Line Items]                  
Combined volume allocate to TEG and other energy producer | T 950,000                
Stop-loss limits value under medical assistance $ 400,000                
Top of range [member] | Employees [Member]                  
Disclosure of Commitments and Contingencies [Line Items]                  
Stop-loss limits value under medical assistance 2,500,000                
International Business Machines Corporation [Member]                  
Disclosure of Commitments and Contingencies [Line Items]                  
Strategic agreement period     10-year            
Ventikas [Member]                  
Disclosure of Commitments and Contingencies [Line Items]                  
Acquired energy usage period   20 years              
Estimated annual cost 27,000,000                
Combined generation capacity | MWh   252              
EURUS [Member]                  
Disclosure of Commitments and Contingencies [Line Items]                  
Acquired energy usage period       20 years          
Estimated annual cost 71,000,000                
Installed capacity       250 MW          
Termoelectrica del Golfo [Member]                  
Disclosure of Commitments and Contingencies [Line Items]                  
Estimated annual cost $ 110,000,000                
Combined volume allocate to TEG and other energy producer | T 1,200,000                
CEMEX Ostzement GmbH [Member]                  
Disclosure of Commitments and Contingencies [Line Items]                  
Estimated annual cost         $ 12,000,000