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Cover Page
 12 Months Ended
Dec. 31, 2020
shares
Document Information [Line Items]  
Document Type 20-F
Amendment Flag false
Document Period End Date Dec. 31, 2020
Document Fiscal Year Focus 2020
Document Fiscal Period Focus FY
Trading Symbol CX
Title of 12(b) Security American Depositary Shares
Security Exchange Name NYSE
Entity Registrant Name CEMEX SAB DE CV
Entity Central Index Key 0001076378
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer Yes
Entity Current Reporting Status Yes
Entity Filer Category Large Accelerated Filer
Entity Emerging Growth Company false
Entity Shell Company false
Entity Common Stock, Shares Outstanding 14,711,512,721
Entity Voluntary Filers No
Entity Interactive Data Current Yes
Entity Address, Country MX
Document Annual Report true
Document Transition Report false
Document Shell Company Report false
ICFR Auditor Attestation Flag true
Series A Shares [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 29,457,941,452
Series B Shares [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 14,728,970,726