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Subsequent Events - Additional Information (Detail)
T in Thousands, MT in Millions, $ in Millions
 2 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
Quarry
Concreteplants
Mar. 26, 2021
EUR (€)
Mar. 25, 2021
USD ($)
Mar. 22, 2021
USD ($)
Feb. 01, 2021
T
MT
Jan. 13, 2021
USD ($)
Jan. 12, 2021
USD ($)
shares
Feb. 28, 2021
shares
Dec. 31, 2020
USD ($)
T
Dec. 31, 2020
EUR (€)
T
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Disclosure of non-adjusting events after reporting period [line items]                        
Notional amount                 $ 2,230.0   $ 2,324.0  
Amount of assessment for income taxes                 $ 52.0   $ 162.0 $ 224.0
Upfront premium net $ 10.8                      
Contract amount $ 250.0                      
CO2 Emission Allowances In The European Union [Member]                        
Disclosure of non-adjusting events after reporting period [line items]                        
Number of allowances sold                 12,300,000      
Proceeds from allowances sold                 $ 600.0 € 509    
Rhone Alpes [Member]                        
Disclosure of non-adjusting events after reporting period [line items]                        
Number of aggregate quarries sold | Quarry 1                      
MEXICO                        
Disclosure of non-adjusting events after reporting period [line items]                        
Amended annual production capacity of cement | T                 1,100 1,100    
Europe [Member] | CEMEX Cement Plants [Member] | CO2 Emission Allowances In The European Union [Member]                        
Disclosure of non-adjusting events after reporting period [line items]                        
Percentage of estimated reudction in the co2 emissions allowances                 35.00% 35.00%    
Full Redemption [member] | January 2025 Dollar Notes [Member]                        
Disclosure of non-adjusting events after reporting period [line items]                        
Aggregate principal amount redemption       $ 321.0                
Full Redemption of remainder balance of notes date       April 21, 2021                
Events after reporting period [member]                        
Disclosure of non-adjusting events after reporting period [line items]                        
Number Of Shares Cumulatively Repurchased In Shares | shares             3.875          
Events after reporting period [member] | Equity Forward Contract [Member]                        
Disclosure of non-adjusting events after reporting period [line items]                        
Forward contract to be settled in shares | shares               4,700,000        
Events after reporting period [member] | Environmental License Agreement [Member] | CI Calizas [Member]                        
Disclosure of non-adjusting events after reporting period [line items]                        
Amended annual production capacity of cement | MT         1.5              
Modification of environmental license results to possible extract of clay and limestone | T         990              
Events after reporting period [member] | CEMEX, S.A.B. de C.V. July 2031 Senior Secured Notes [member] | Notes payable [member]                        
Disclosure of non-adjusting events after reporting period [line items]                        
Borrowings, interest rate             3.875%          
Notional amount             $ 1,750.0          
Long-term borrowings maturity date             Jul. 11, 2031          
Frequency Of Periodic Interest Payment             semi-annually          
Borrowings Principal Price Percentage             100.00%          
Borrowings Repurchase Commencement Date             Jul. 11, 2026          
Borrowings Issuer Name             CEMEX, S.A.B. de C.V.          
Events after reporting period [member] | CEMEX, S.A.B. de C.V. April 2026 Notes [member] | Notes payable [member]                        
Disclosure of non-adjusting events after reporting period [line items]                        
Borrowings, interest rate           7.75%            
Notional amount           $ 1,071.0            
Frequency Of Periodic Interest Payment           semi-annually            
Borrowings Repurchased and Cancelled Amount           $ 1,000.0            
Events after reporting period [member] | CEMEX, S.A.B. de C.V. January 2025 Notes [member] | Notes payable [member]                        
Disclosure of non-adjusting events after reporting period [line items]                        
Borrowings, interest rate           5.70%            
Frequency Of Periodic Interest Payment           semi-annually            
Borrowings Repurchased and Cancelled Amount           $ 750.0            
Events after reporting period [member] | Rhone Alpes [Member]                        
Disclosure of non-adjusting events after reporting period [line items]                        
Number of assets sold | Concreteplants 24                      
Events after reporting period [member] | FRANCE                        
Disclosure of non-adjusting events after reporting period [line items]                        
Sale of assets, agreed price $ 45.0                      
Events after reporting period [member] | SPAIN | Tax Years 2010 to 2014 [Member] | Tax Authority Spain [Member]                        
Disclosure of non-adjusting events after reporting period [line items]                        
Amount of assessment for income taxes | €   € 48                    
Events after reporting period [member] | MEXICO                        
Disclosure of non-adjusting events after reporting period [line items]                        
Maximum amount of resources to be maintained     $ 500.0