XML 262 R100.htm IDEA: XBRL DOCUMENT v3.22.0.1

Employment - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2019 Employees
Continuing and Discontinued Operations [member]
Disclosure of employment expenses [line items]
Average number of employees	86,951

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose employment expenses.

+ References

No definition available.

+ Details

Name:	crh_DisclosureOfEmploymentExpensesLineItems
Namespace Prefix:	crh_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The average number of personnel employed by the entity during a period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2021-03-24

+ Details

Name:	ifrs-full_AverageNumberOfEmployees
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_ContinuingAndDiscontinuedOperationsAxis=crh_ContinuingAndDiscontinuedOperationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: