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Goodwill and Intangible Assets, Net - Summary of Goodwill Balances Allocated by Operating Segment (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill $ 8,506 $ 9,562 $ 9,912 $ 9,948
Mexico [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill 372 384    
United States [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill 6,449 7,469    
Spain [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill 463 494    
United Kingdom [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill 292 279    
France [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill 229 221    
Rest of EMEAA [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill [1] 44 42    
Colombia [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill 283 296    
Caribbean TCL [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill 92 100    
Rest of South, Central America and the Caribbean [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill [2] 64 62    
Philippines [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill 95 92    
United Arab Emirates [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill 96 96    
Other countries [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Goodwill [3] $ 27 $ 27    
[1] This caption refers to the operating segments in the Czech Republic and Egypt.
[2] This caption refers to the operating segments in the Dominican Republic, the Caribbean, Costa Rica and Panama.
[3] This caption is primarily associated with Neoris N.V., CEMEX’s subsidiary involved in the sale of information technology and services.