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Stockholders' Equity - Additional Information (Detail)
 12 Months Ended
Dec. 17, 2019
$ / shares
Jun. 17, 2019
$ / shares
Mar. 28, 2019
USD ($)
$ / shares
shares
Jul. 18, 2016
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
shares
Mar. 26, 2020
USD ($)
$ / shares
shares
Disclosure of Classes of Share Capital [Line Items]                
Additional paid-in capital         $ 7,575,000,000 $ 10,106,000,000    
Percentage of net income allocation toward legal reserve         5.00%      
Legal reserve         $ 95,000,000      
Non-controlling interest and perpetual debentures         877,000,000 1,503,000,000    
Coupon payment on perpetual debentures         (2,453,000,000) (2,724,000,000)    
Dividend Declaration Date     Mar. 28, 2019          
Dividend declared     $ 150,000,000          
Dividend amount per share | $ / shares $ 0.001654 $ 0.001663            
Purchase of treasury shares         83,000,000 50,000,000 $ 75,000,000  
Explanation of the fact that shares have no par value     without par-value          
Share price | $ / shares               $ 0.22
Treasury shares         11,000,000 $ 8,000,000   $ 83,000,000
Restitution of retained earnings         2,481,000,000      
Mandatory Convertible Securities [member] | Mandatory Convertible Securities 2019 [member]                
Disclosure of Classes of Share Capital [Line Items]                
Borrowings interest rate               3.72%
Parent [member]                
Disclosure of Classes of Share Capital [Line Items]                
Coupon payment on perpetual debentures         $ 974,000,000      
Pesos [Member]                
Disclosure of Classes of Share Capital [Line Items]                
Closing foreign exchange rate         19.89 18.9200 19.6500  
Coupon Payment [Member]                
Disclosure of Classes of Share Capital [Line Items]                
Coupon payment on perpetual debentures         $ 24,000,000 $ 29,000,000 $ 29,000,000  
Two Thousand And Nineteen Treasury Repurchase Program [member]                
Disclosure of Classes of Share Capital [Line Items]                
Treasury shares repurchase amount authorized     $ 500,000,000         $ 500,000,000
Two Thousand And Nineteen Treasury Repurchase Program [member] | Share Repurchase One [member]                
Disclosure of Classes of Share Capital [Line Items]                
Purchase of treasury shares     282,600          
Cancellation of treasury shares     $ 282,600          
Purchase of treasury shares in shares | shares     2,000,000,000          
Decrease in variable part of common stock treasury shares repurchased and cancelled | shares     2,000,000,000          
Two Thousand And Nineteen Treasury Repurchase Program [member] | Share Repurchase Two [member]                
Disclosure of Classes of Share Capital [Line Items]                
Purchase of treasury shares     $ 67,000          
Cancellation of treasury shares     $ 67,000          
Purchase of treasury shares in shares | shares     461,000,000          
Decrease in variable part of common stock treasury shares repurchased and cancelled | shares     461,000,000          
Dividend Declared Date One [Member]                
Disclosure of Classes of Share Capital [Line Items]                
Dividend declared date of payment   Jun. 17, 2019            
Dividend Declared Date Two [Member]                
Disclosure of Classes of Share Capital [Line Items]                
Dividend declared date of payment Dec. 17, 2019              
Additional paid-in capital [member]                
Disclosure of Classes of Share Capital [Line Items]                
Additional paid-in capital           32,000,000 34,000,000  
Purchase of treasury shares         50,000,000 75,000,000    
Restitution of retained earnings         (2,481,000,000)      
Non-controlling Interest [member]                
Disclosure of Classes of Share Capital [Line Items]                
Non-controlling interest and perpetual debentures         428,000,000 1,060,000,000    
Net income attributable to noncontroling interest         21,000,000 36,000,000 $ 42,000,000  
Variable Part Of Share Capital [Member]                
Disclosure of Classes of Share Capital [Line Items]                
Increase in variable common stock share issue     $ 22,000          
Increase in variable common stock share issue in shares | shares     150,000,000          
Share price | $ / shares     $ 0.000143          
Perpetual Subordinated Bonds [member]                
Disclosure of Classes of Share Capital [Line Items]                
Non-controlling interest and perpetual debentures         $ 449,000,000 $ 443,000,000    
CEMEX Holdings Philippines, Inc. [member]                
Disclosure of Classes of Share Capital [Line Items]                
Non-controlling interest ownership percentage           45.00% 33.22%  
Number of shares issued | shares       2,337,927,954        
Percentage of outstanding common shares owned by the subsidiary       45.00%        
Reduction in non-controlling interest         22.16% 33.22%    
CEMEX Latam Holdings, S.A. [member]                
Disclosure of Classes of Share Capital [Line Items]                
Non-controlling interest ownership percentage         7.63% 26.83%    
Caribbean TCL [member] | Trinidad Cement Limited [member]                
Disclosure of Classes of Share Capital [Line Items]                
Non-controlling interest ownership percentage         30.17% 30.17%    
CPO [Member]                
Disclosure of Classes of Share Capital [Line Items]                
Number of shares issued | shares           27,400,000 49,300,000  
Number of shares cumulatively repurchased | shares               378,200,000
CPO [Member] | Parent [member]                
Disclosure of Classes of Share Capital [Line Items]                
Treasury shares         $ 11,000,000 $ 8,000,000    
Investment in shares held by the subsidiary | shares         (20,541,277) (20,541,277)    
CPO [Member] | Treasury shares [member] | Two Thousand And Nineteen Treasury Repurchase Program [member]                
Disclosure of Classes of Share Capital [Line Items]                
Share price | $ / shares           $ 0.3164    
Number of shares cumulatively repurchased | shares           157,700,000    
Treasury shares           $ 50,000,000 $ 50,000,000