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Commitments - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Jul. 27, 2012
Apr. 30, 2016
MWh
Feb. 28, 2010
Dec. 31, 2018
USD ($)
T
Dec. 31, 2018
MXN ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Disclosure of Commitments and Contingencies [Line Items]                  
Guaranteed loans of certain subsidiaries         $ 29,331,000,000 $ 1,493,000,000 $ 29,601,000,000 $ 1,506,000,000  
Liabilities secured by property, machinery and equipment         $ 0   $ 0    
Self-insured health care benefits           62,000,000   $ 64,000,000 $ 69,000,000
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           25,000,000      
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           132,000,000      
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           $ 15,000,000