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Financial Instruments - Additional Information - Credit Agreement, Facilities Agreement and Financing Agreement (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jul. 31, 2023
Dec. 17, 2020
Nov. 04, 2019
Dec. 31, 2020
Dec. 31, 2019
Oct. 13, 2020
Apr. 02, 2019
Dec. 31, 2017
Jul. 19, 2017
Disclosure of detailed information about financial instruments [line items]                  
Long Term debt       $ 9,160.0 $ 9,303.0        
Later than two years and not later than three years [member]                  
Disclosure of detailed information about financial instruments [line items]                  
Long Term debt       772.0          
CEMEX Holdings Philippines, Inc. [member]                  
Disclosure of detailed information about financial instruments [line items]                  
Maximum capital expenditure       500.0 500.0        
CEMEX Latam Holdings, S.A [member]                  
Disclosure of detailed information about financial instruments [line items]                  
Maximum capital expenditure       1,500.0 1,500.0        
Acquisitions and investments in joint ventures       $ 400.0 $ 400.0        
Pounds [member]                  
Disclosure of detailed information about financial instruments [line items]                  
Interest rate       2.50% 3.20%        
Long Term debt       $ 329.0 $ 433.0        
Mexico, Pesos                  
Disclosure of detailed information about financial instruments [line items]                  
Interest rate       6.80%          
Long Term debt       $ 334.0          
2017 Credit Agreement [member]                  
Disclosure of detailed information about financial instruments [line items]                  
Bank indebtedness       2,420.0 $ 2,897.0       $ 4,050.0
Revolving Credit Facility Amount Extended           $ 1.1 $ 1,060.0    
Repurchase of Share Issuance Amount     $ 500.0            
Allowance for disposals of non controlling interests per year     $ 100.0            
Revolving Credit Facility Amount Extended Commitments       1.1          
2017 Credit Agreement [member] | Pounds [member]                  
Disclosure of detailed information about financial instruments [line items]                  
Nominal value of Debt Converted in to Other Currency       82.0          
2017 Credit Agreement [member] | Mexico, Pesos                  
Disclosure of detailed information about financial instruments [line items]                  
Amortizing in Four Equal Payments $ 313.0                
Nominal value of Debt Converted in to Other Currency       $ 313.0          
2014 Credit Agreement [member]                  
Disclosure of detailed information about financial instruments [line items]                  
Bank indebtedness               $ 3,680.0  
Bottom of range [member] | Credit agreement [member]                  
Disclosure of detailed information about financial instruments [line items]                  
Interest rate       1.65%          
Bottom of range [member] | 2017 Credit Agreement [member]                  
Disclosure of detailed information about financial instruments [line items]                  
Debt instrument maturity date   2023              
Long Term debt       $ 43.0          
Bottom of range [member] | 2017 Credit Agreement [member] | Later than two years and not later than three years [member]                  
Disclosure of detailed information about financial instruments [line items]                  
Debt instrument maturity date       2022          
Bottom of range [member] | 2017 Credit Agreement [member] | Later than six months and not later than one year [member]                  
Disclosure of detailed information about financial instruments [line items]                  
Debt instrument maturity date       2022          
Top of range [member] | Credit agreement [member]                  
Disclosure of detailed information about financial instruments [line items]                  
Interest rate       3.94%          
Top of range [member] | 2017 Credit Agreement [member]                  
Disclosure of detailed information about financial instruments [line items]                  
Debt instrument maturity date   2025              
Long Term debt       $ 93.0          
Top of range [member] | 2017 Credit Agreement [member] | Later than two years and not later than three years [member]                  
Disclosure of detailed information about financial instruments [line items]                  
Debt instrument maturity date       2025          
Top of range [member] | 2017 Credit Agreement [member] | Later than six months and not later than one year [member]                  
Disclosure of detailed information about financial instruments [line items]                  
Debt instrument maturity date       2023