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Pensions and Post-Employment Benefits - 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 ($)
Dec. 31, 2012
USD ($)
Disclosure of defined benefit plans [line items]            
Costs of defined contribution plans $ 863   $ 922   $ 865  
Projected benefits obligation 48,256   56,346   52,219  
increase in the net projected liability 396   199   $ 184  
Post employment healthcare benefits [member]            
Disclosure of defined benefit plans [line items]            
Projected benefits obligation $ 1,133   1,080      
London Interbank Offered Rate (LIBOR) [Member]            
Disclosure of defined benefit plans [line items]            
Significant assumptions 0.50%          
Trinidad Cement Limited [member]            
Disclosure of defined benefit plans [line items]            
increase in the net projected liability $ 111 $ 6 271 $ 14    
Mexico [member]            
Disclosure of defined benefit plans [line items]            
Projected benefits obligation $ 3,300   $ 3,213      
Medical inflation rates used to determine the projected benefits obligation 7.00%   7.00%      
Puerto Rico [member]            
Disclosure of defined benefit plans [line items]            
Medical inflation rates used to determine the projected benefits obligation 6.20%   6.90%      
United Kingdom [member]            
Disclosure of defined benefit plans [line items]            
Projected benefits obligation $ 28,771   $ 35,602      
Medical inflation rates used to determine the projected benefits obligation 6.80%   6.70%      
United States [member]            
Disclosure of defined benefit plans [line items]            
Projected benefits obligation $ 5,619   $ 6,378      
Medical inflation rates used to determine the projected benefits obligation 5.00%   5.00%      
Spain [member]            
Disclosure of defined benefit plans [line items]            
Income from prior period adjustment of retirement benefit     $ 99 $ 5    
CEMEX U.K. [member]            
Disclosure of defined benefit plans [line items]            
Operating assets           $ 553
Dividends received           $ 20
Percentage of annual rate           5.00%