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Financial Instruments - Additional Information - Credit Agreement, Facilities Agreement and Financing Agreement (Detail)
€ in Millions, £ in Millions, $ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Sep. 17, 2012
USD ($)
Nov. 30, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
GBP (£)
Jul. 19, 2017
USD ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2016
EUR (€)
Nov. 30, 2016
MXN ($)
Jul. 30, 2015
USD ($)
Jul. 30, 2015
MXN ($)
Sep. 29, 2014
USD ($)
Disclosure of detailed information about financial instruments [line items]                              
Bank indebtedness         $ 3,062 $ 56,879       $ 52,763          
Maturity period     4 years 3 months 19 days                        
Maximum capital expenditure     $ 1,000 $ 1,000                      
Acquisitions and investments in joint ventures     $ 400 $ 400                      
Leverage ratio     3.85 4.22 5.21                    
CEMEX Holdings Philippines, Inc. [member]                              
Disclosure of detailed information about financial instruments [line items]                              
Maximum capital expenditure     $ 500 $ 500                      
CEMEX Latam Holdings, S.A [member]                              
Disclosure of detailed information about financial instruments [line items]                              
Maximum capital expenditure     $ 500 $ 500                      
Euro [member]                              
Disclosure of detailed information about financial instruments [line items]                              
Interest rate     3.50% 4.30%   3.50% 3.50% 3.50%   4.30% 4.30%        
US Dollar [member]                              
Disclosure of detailed information about financial instruments [line items]                              
Interest rate     5.90% 6.30%   5.90% 5.90% 5.90%   6.30% 6.30%        
Pesos [Member]                              
Disclosure of detailed information about financial instruments [line items]                              
Interest rate     0.00% 4.40%   0.00% 0.00% 0.00%   4.40% 4.40%        
Pounds [member]                              
Disclosure of detailed information about financial instruments [line items]                              
Interest rate     2.60% 0.00%   2.60% 2.60% 2.60%   0.00% 0.00%        
Credit agreement [member]                              
Disclosure of detailed information about financial instruments [line items]                              
Credit agreement amount     $ 2,746 $ 785   $ 53,959       $ 16,259          
Prepayments   $ 373                   $ 7,729      
Funded commitments   $ 664                          
Credit agreement [member] | Later Than One Year and Not Later Than Two Years [Member]                              
Disclosure of detailed information about financial instruments [line items]                              
Amortization amounts       783                      
Credit agreement [member] | Later Than Two Years and Not Later Than Three Years [Member]                              
Disclosure of detailed information about financial instruments [line items]                              
Amortization amounts       883                      
Credit agreement [member] | Later Than Three Years and Not Later Than Four Years [Member]                              
Disclosure of detailed information about financial instruments [line items]                              
Amortization amounts       1,096                      
Credit agreement [member] | Revolving Credit Facility [member]                              
Disclosure of detailed information about financial instruments [line items]                              
Credit agreement amount     1,135 1,413   22,303       29,277          
Credit agreement [member] | Euro [member]                              
Disclosure of detailed information about financial instruments [line items]                              
Credit agreement amount | €             € 741       € 746        
Credit agreement [member] | US Dollar [member]                              
Disclosure of detailed information about financial instruments [line items]                              
Credit agreement amount     889 $ 2,826                      
Credit agreement [member] | Pesos [Member]                              
Disclosure of detailed information about financial instruments [line items]                              
Credit agreement amount           17,469       $ 58,555          
2017 Credit Agreement [member]                              
Disclosure of detailed information about financial instruments [line items]                              
Bank indebtedness     4,050           $ 4,050            
2017 Credit Agreement [member] | US Dollar [member]                              
Disclosure of detailed information about financial instruments [line items]                              
Credit agreement amount     465                        
2017 Credit Agreement [member] | Pesos [Member]                              
Disclosure of detailed information about financial instruments [line items]                              
Credit agreement amount           $ 9,137                  
2017 Credit Agreement [member] | Pounds [member]                              
Disclosure of detailed information about financial instruments [line items]                              
Credit agreement amount | £               £ 344              
2014 Credit Agreement [member]                              
Disclosure of detailed information about financial instruments [line items]                              
Bank indebtedness     $ 3,680                       $ 3,680
Less than or equal to 4.0 ratio [Member]                              
Disclosure of detailed information about financial instruments [line items]                              
Leverage ratio     4.0                        
Less Than Or Equal To 3.75 Ratio [Member]                              
Disclosure of detailed information about financial instruments [line items]                              
Leverage ratio     3.75                        
Bottom of range [member] | Credit agreement [member]                              
Disclosure of detailed information about financial instruments [line items]                              
Interest rate     1.25%     1.25% 1.25% 1.25%              
Debt instrument basis point       1.25%           1.25% 1.25%        
Bottom of range [member] | 2017 Credit Agreement [member]                              
Disclosure of detailed information about financial instruments [line items]                              
Interest rate basis     0.0125                        
Top of range [member]                              
Disclosure of detailed information about financial instruments [line items]                              
Leverage ratio     3.75                        
Top of range [member] | Credit agreement [member]                              
Disclosure of detailed information about financial instruments [line items]                              
Interest rate     6.50%     6.50% 6.50% 6.50%              
Debt instrument basis point       3.50%           3.50% 3.50%        
Top of range [member] | 2017 Credit Agreement [member]                              
Disclosure of detailed information about financial instruments [line items]                              
Interest rate basis     0.0350                        
Facilities Agreement [member] | Credit agreement [member]                              
Disclosure of detailed information about financial instruments [line items]                              
Credit agreement amount                         $ 1,937 $ 33,375  
Amount of debt repaid $ 1,350