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Subsequent Events - Additional Information (Detail)
T in Thousands, € in Millions, $ in Millions
Apr. 30, 2019
EUR (€)
Apr. 15, 2019
EUR (€)
Apr. 12, 2019
T
Apr. 02, 2019
USD ($)
Mar. 29, 2019
USD ($)
Mar. 29, 2019
EUR (€)
Mar. 19, 2019
EUR (€)
Plant
Quarry
Mar. 12, 2019
EUR (€)
Feb. 20, 2019
EUR (€)
Plant
Terminal
Quarry
Dec. 31, 2018
EUR (€)
4.375% Senior Secured Notes due 2023 [member]                    
Disclosure of non-adjusting events after reporting period [line items]                    
Aggregate principal                   € 550
Announcement of pan to discontinue operation [member]                    
Disclosure of non-adjusting events after reporting period [line items]                    
Sale of assets, agreed price         $ 180   € 87   € 340  
Announcement of pan to discontinue operation [member] | SCHWENK [member]                    
Disclosure of non-adjusting events after reporting period [line items]                    
Proceeds from divestiture of assets           € 340        
Announcement of pan to discontinue operation [member] | Latvia [member]                    
Disclosure of non-adjusting events after reporting period [line items]                    
Number of cement production plant sold | Plant                 1  
Number of aggregate quarries sold | Quarry                 4  
Number of cement quarries sold | Quarry                 2  
Number of ready mix concrete plants sold | Plant                 6  
Number of marine terminal sold | Terminal                 1  
Number of land distribution terminal sold | Terminal                 1  
Announcement of pan to discontinue operation [member] | LITHUANIA                    
Disclosure of non-adjusting events after reporting period [line items]                    
Percentage of indirect assets                 38.00%  
Announcement of pan to discontinue operation [member] | FINLAND                    
Disclosure of non-adjusting events after reporting period [line items]                    
Number of import terminals sold | Terminal                 3  
Announcement of pan to discontinue operation [member] | NORWAY                    
Disclosure of non-adjusting events after reporting period [line items]                    
Number of import terminals sold | Terminal                 4  
Announcement of pan to discontinue operation [member] | SWEDEN                    
Disclosure of non-adjusting events after reporting period [line items]                    
Number of import terminals sold | Terminal                 4  
Announcement of pan to discontinue operation [member] | North Germany [member]                    
Disclosure of non-adjusting events after reporting period [line items]                    
Number of aggregate quarries sold | Quarry             4      
Number of ready mix concrete plants sold | Plant             4      
Announcement of pan to discontinue operation [member] | North west Germany [member]                    
Disclosure of non-adjusting events after reporting period [line items]                    
Number of aggregate quarries sold | Quarry             9      
Number of ready mix concrete plants sold | Plant             14      
Debt Issued [member] | 3.125% Senior Secured Notes due 2026 [member]                    
Disclosure of non-adjusting events after reporting period [line items]                    
Aggregate principal               € 400    
Interest rate               3.125%    
Borrowings maturity               March 19, 2026    
Borrowings issue price, percentage               100.00%    
Partial redemption [member] | 4.375% Senior Secured Notes due 2023 [member]                    
Disclosure of non-adjusting events after reporting period [line items]                    
Aggregate principal   € 400                
Full Redemption [member] | 4.375% Senior Secured Notes due 2023 [member]                    
Disclosure of non-adjusting events after reporting period [line items]                    
Aggregate principal amount redemption € 150                  
Full Redemption [member] | CEMEX, S.A.B. de C.V. March 2023 Notes [member]                    
Disclosure of non-adjusting events after reporting period [line items]                    
Aggregate principal amount redemption   € 400                
Events after reporting period [member]                    
Disclosure of non-adjusting events after reporting period [line items]                    
Principal amount of maturities extending for amendment process | $       $ 1,100            
Agreement maturity period       3 years            
Percentage of maturities aggregate under credit agreement       92.00%            
Events after reporting period [member] | 3.72 % subordinated convertible notes [member]                    
Disclosure of non-adjusting events after reporting period [line items]                    
Aggregate principal | $       $ 521            
Events after reporting period [member] | Lease agreements [member]                    
Disclosure of non-adjusting events after reporting period [line items]                    
Lease assets duration     21 years              
Extended lease assets duration     10 years              
Amended annual production capacity of cement | T     950