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Financial Instruments - Summary of Long Term Notes Payable (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items]    
Long term borrowings $ 7,306 $ 9,160
Notes payable [member]    
Disclosure of detailed information about financial instruments [line items]    
Long term borrowings 5,357 6,511
Notes payable [member] | Other Notes Payable [member]    
Disclosure of detailed information about financial instruments [line items]    
Long term borrowings $ 26 31
Notes payable [member] | CEMEX SAB de CV July 2031 Notes [Member]    
Disclosure of detailed information about financial instruments [line items]    
Date of issuance Jan. 12, 2021  
Issuer CEMEX, S.A.B. de C.V.  
Currency Dollar  
Principal amount $ 1,750  
Rate 3.875%  
Maturity date Jul. 11, 2031  
Long term borrowings $ 1,741  
Notes payable [member] | CEMEX SAB de CV July 2031 Notes [Member] | Cost [member]    
Disclosure of detailed information about financial instruments [line items]    
Long term borrowings $ 1,750  
Notes payable [member] | CEMEX, S.A.B. de C.V. September 2030 Notes [Member]    
Disclosure of detailed information about financial instruments [line items]    
Date of issuance Sep. 17, 2020  
Issuer CEMEX, S.A.B. de C.V.  
Currency Dollar  
Principal amount $ 1,000  
Rate 5.20%  
Maturity date Sep. 17, 2030  
Long term borrowings $ 995 995
Notes payable [member] | CEMEX, S.A.B. de C.V. September 2030 Notes [Member] | Cost [member]    
Disclosure of detailed information about financial instruments [line items]    
Long term borrowings $ 1,000  
Notes payable [member] | CEMEX, S.A.B. de C.V. November 2029 Notes [member]    
Disclosure of detailed information about financial instruments [line items]    
Date of issuance Nov. 19, 2019  
Issuer CEMEX, S.A.B. de C.V.  
Currency Dollar  
Principal amount $ 1,000  
Rate 5.45%  
Maturity date Nov. 19, 2029  
Long term borrowings $ 994 993
Notes payable [member] | CEMEX, S.A.B. de C.V. November 2029 Notes [member] | Cost [member]    
Disclosure of detailed information about financial instruments [line items]    
Long term borrowings $ 1,000  
Notes payable [member] | CEMEX, S.A.B. de C.V. June 2027 Notes [member]    
Disclosure of detailed information about financial instruments [line items]    
Date of issuance Jun. 05, 2020  
Issuer CEMEX, S.A.B. de C.V.  
Currency Dollar  
Principal amount $ 1,000  
Rate 7.375%  
Maturity date Jun. 05, 2027  
Long term borrowings $ 995 994
Notes payable [member] | CEMEX, S.A.B. de C.V. June 2027 Notes [member] | Cost [member]    
Disclosure of detailed information about financial instruments [line items]    
Long term borrowings $ 1,000  
Notes payable [member] | CEMEX, S.A.B. de C.V. April 2026 Notes [member]    
Disclosure of detailed information about financial instruments [line items]    
Date of issuance Mar. 16, 2016  
Issuer CEMEX, S.A.B. de C.V.  
Currency Dollar  
Principal amount $ 1,000  
Rate 7.75%  
Maturity date Apr. 16, 2026  
Repurchased amount $ (1,000)  
Long term borrowings   997
Notes payable [member] | CEMEX, S.A.B. de C.V. March 2026 Notes [member]    
Disclosure of detailed information about financial instruments [line items]    
Date of issuance Mar. 19, 2019  
Issuer CEMEX, S.A.B. de C.V.  
Currency Euro  
Principal amount $ 400  
Rate 3.125%  
Maturity date Mar. 19, 2026  
Long term borrowings $ 454 487
Notes payable [member] | CEMEX, S.A.B. de C.V. March 2026 Notes [member] | Cost [member]    
Disclosure of detailed information about financial instruments [line items]    
Long term borrowings $ 455  
Notes payable [member] | CEMEX Materials LLC July 2025 Notes [member]    
Disclosure of detailed information about financial instruments [line items]    
Date of issuance Apr. 01, 2003  
Issuer CEMEX Materials LLC  
Currency Dollar  
Principal amount $ 150  
Rate 7.70%  
Maturity date Jul. 21, 2025  
Long term borrowings $ 152 153
Notes payable [member] | CEMEX Materials LLC July 2025 Notes [member] | Cost [member]    
Disclosure of detailed information about financial instruments [line items]    
Long term borrowings $ 150  
Notes payable [member] | CEMEX, S.A.B. de C.V. January 2025 Notes [member]    
Disclosure of detailed information about financial instruments [line items]    
Date of issuance Sep. 11, 2014  
Issuer CEMEX, S.A.B. de C.V.  
Currency Dollar  
Principal amount $ 1,100  
Rate 5.70%  
Maturity date Jan. 11, 2025  
Repurchased amount $ (1,100)  
Long term borrowings   1,069
Notes payable [member] | CEMEX, SAB. de CV. December 2024 Notes [member]    
Disclosure of detailed information about financial instruments [line items]    
Date of issuance Dec. 05, 2017  
Issuer CEMEX, S.A.B. de C.V.  
Currency Euro  
Principal amount $ 650  
Rate 2.75%  
Maturity date Dec. 05, 2024  
Repurchased amount $ (650)  
Long term borrowings   $ 792