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Finance Costs and Finance Income - Summary of Finance Costs and Finance Income (Parenthetical) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Continuing and Discontinued Operations [member]
Statement [Line Items]
Net finance cost	$ 498

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- Definition

Net finance cost.

+ References

No definition available.

+ Details

Name:	crh_NetFinanceCost
Namespace Prefix:	crh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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

X

- Details

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