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Cover Page - shares
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2019
Document Information [Line Items]    
Document Type 20-F  
Amendment Flag false  
Document Period End Date Dec. 31, 2021  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus FY  
Entity Registrant Name CRH PUBLIC LTD CO  
Entity Central Index Key 0000849395  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
No Trading Symbol Flag true  
Entity Voluntary Filers No  
Entity Shell Company false  
Entity Emerging Growth Company false  
Entity Interactive Data Current Yes  
Entity Common Stock, Shares Outstanding 774,140,338  
Document Accounting Standard International Financial Reporting Standards  
Entity Well-known Seasoned Issuer Yes  
Entity Incorporation, State or Country Code L2  
Document Annual Report true  
Entity Address, Country IE  
Document Transition Report false  
Document Shell Company Report false  
Document Registration Statement false  
Entity Current Reporting Status Yes  
Title of 12(b) Security Ordinary Shares  
Security Exchange Name NYSE  
ICFR Auditor Attestation Flag true  
Entity Address, Address Line One Stonemason’s Way  
Entity Address, Address Line Two Rathfarnham  
Entity Address, City or Town Dublin  
Entity Address, Postal Zip Code 16  
Entity File Number 001-32846  
Auditor Name Deloitte Ireland LLP Ernst & Young
Auditor Firm ID 1193 1411
Auditor Location Dublin Ireland Dublin Ireland
Business Contact [Member]    
Document Information [Line Items]    
Entity Address, Country IE  
Contact Personnel Name Jim Mintern  
Contact Personnel Email Address mail@crh.com  
Entity Address, Address Line One Stonemason’s Way  
Entity Address, Address Line Two Rathfarnham  
City Area Code 353  
Local Phone Number 1 404 1000  
Entity Address, City or Town Dublin  
Entity Address, Postal Zip Code 16  
American Depositary Shares [Member]    
Document Information [Line Items]    
Trading Symbol CRH  
Title of 12(b) Security American Depositary Shares, each representing the right to receive one  
Security Exchange Name NYSE