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Commitments - Additional Information (Detail)
T in Millions
 1 Months Ended 12 Months Ended
Oct. 01, 2019
Jul. 27, 2012
Apr. 30, 2016
MWh
Feb. 28, 2010
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
T
MWh
$ / MWh
Dec. 31, 2018
USD ($)
Disclosure of Commitments and Contingencies [Line Items]              
Self-insured health care benefits         $ 61,000,000 $ 62,000,000 $ 62,000,000
Cost per megawatt hour | $ / MWh           25.375  
MX [Member] | Energy Financial Hedge [Member]              
Disclosure of Commitments and Contingencies [Line Items]              
Period of hedging agreement 20 years            
Electric energy expected consumption | MWh           400,000  
Percentage increase in the price of the commodity           1.50%  
Proceeds payments from financial hedge         400,000    
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]              
Stop-loss limits value under medical assistance         550,000    
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         24,000,000    
Combined generation capacity | MWh     252        
EURUS [member]              
Disclosure of Commitments and Contingencies [Line Items]              
Acquired energy usage period       20 years      
Estimated annual cost         67,000,000    
Installed capacity       250 MW      
Termoelectrica del Golfo [member]              
Disclosure of Commitments and Contingencies [Line Items]              
Estimated annual cost         124,000,000    
Combined volume allocate to TEG and other energy producer | T           1.2  
CEMEX Ostzement GmbH [member]              
Disclosure of Commitments and Contingencies [Line Items]              
Estimated annual cost         $ 17,000,000