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Goodwill and Intangible Assets, Net - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about intangible assets [line items]        
Risk free rate   2.20% 2.90%  
Increase in pre-tax discount rate   1.00%    
Decrease in long-term growth rate   1.00%    
Weighted average Operating EBITDA multiple   11.5 11.5 11.1
Discount rates 7.80% 7.80% 7.70%  
Impairment of finite lived intangible assets   $ 194   $ 9
Cash flow projection period   7 years 5 years  
Growth rate for cash flow projections 2.50% 2.50% 2.00%  
Percentage of reduction in value in use of goodwill   25.70%    
Discount rates 7.80% 7.80% 7.70%  
Market risk premium percentage   5.70% 5.60%  
Stock volatility factor   1.19 1.08  
Decrease Of Two Years In Cash Flow Projections [Member]        
Disclosure of detailed information about intangible assets [line items]        
Percentage Allocation In Respect Of Reduction In Value Of Goodwill   51.50%    
Reduction In The Long Term Growth Rate [Member]        
Disclosure of detailed information about intangible assets [line items]        
Percentage Allocation In Respect Of Reduction In Value Of Goodwill   27.30%    
Reduction In Sales Growth [Member]        
Disclosure of detailed information about intangible assets [line items]        
Percentage Allocation In Respect Of Reduction In Value Of Goodwill   28.30%    
Reduction In Discount Rate [Member]        
Disclosure of detailed information about intangible assets [line items]        
Percentage Allocation In Respect Of Reduction In Value Of Goodwill   7.10%    
Operating segments [member]        
Disclosure of detailed information about intangible assets [line items]        
Weighted average Operating EBITDA multiple   11.5    
Others intangible assets [Member]        
Disclosure of detailed information about intangible assets [line items]        
Impairment of finite lived intangible assets [1]   $ 13    
Cemex [Member]        
Disclosure of detailed information about intangible assets [line items]        
Funding cost percentage   4.10% 5.40% 7.30%
Risk free rate     2.90%  
Discount rates 0.10% 0.10% 1.50%  
Decrease In Weighing Of Debt Percentage   34.60% 31.70% 33.50%
Discount rates 0.10% 0.10% 1.50%  
Cemex [Member] | Operating segments [member]        
Disclosure of detailed information about intangible assets [line items]        
Discount rates     0.60% 2.60%
Discount rates     0.60% 2.60%
Top of range [member]        
Disclosure of detailed information about intangible assets [line items]        
Funding cost percentage   4.10%    
Risk free rate   2.30%    
Top of range [member] | Cemex [Member]        
Disclosure of detailed information about intangible assets [line items]        
Decription Of Stock Volatility Rate Increase     1.08%  
Bottom of range [member] | Cemex [Member]        
Disclosure of detailed information about intangible assets [line items]        
Decription Of Stock Volatility Rate Increase       1.06%
United States [member]        
Disclosure of detailed information about intangible assets [line items]        
Percentage of goodwill allocated   76.00% 78.00%  
Discount rates 7.30% 7.30% 7.80% 8.50%
Impairment of finite lived intangible assets   $ 181    
Growth rate for cash flow projections 2.00% 2.00% 2.50%  
Discount rates 7.30% 7.30% 7.80% 8.50%
Percentage reduction in long term growth rate   0.50%    
United States [member] | Operating segments [member]        
Disclosure of detailed information about intangible assets [line items]        
Discount rates 1.00% 1.00%    
Growth rate for cash flow projections 1.00% 1.00%    
Discount rates 1.00% 1.00%    
United States [member] | Goodwill [member] | Operating segments [member]        
Disclosure of detailed information about intangible assets [line items]        
Impairment of finite lived intangible assets $ 1,020      
Mexico [member]        
Disclosure of detailed information about intangible assets [line items]        
Discount rates 8.30% 8.30% 9.00% 9.40%
Growth rate for cash flow projections 1.10% 1.10% 2.40% 3.00%
Discount rates 8.30% 8.30% 9.00% 9.40%
Percentage reduction in long term growth rate   1.30%    
Colombia [member]        
Disclosure of detailed information about intangible assets [line items]        
Discount rates 8.40% 8.40% 8.90% 9.50%
Growth rate for cash flow projections 2.50% 2.50% 3.70% 3.60%
Discount rates 8.40% 8.40% 8.90% 9.50%
Percentage reduction in long term growth rate   1.20%    
[1] In 2020 and 2019, “Others” includes the carrying amount of internal-use software of $213 and $253, respectively. Capitalized direct costs incurred in the development stage of internal-use software, such as professional fees, direct labor and related travel expenses amounted to $40 in 2020, $102 in 2019 and $133 in 2018.