Property, Plant and Equipment - Schedule of Future Purchase Commitments for Property, Plant and Equipment (Parenthetical) (Detail) € in Millions	Dec. 31, 2018 EUR (€)
Disclosure of detailed information about property, plant and equipment [abstract]
Contractual Commitments Include Not Provided For Discountinued Operations	€ 22
Contractual Commitments Authorised But Not Contracts To Discontinued Operations	€ 6

Contractual Commitments Authorised But Not Contracts Relates To Discontinued Operations

No definition available.

Name:	crh_ContractualCommitmentsAuthorisedButNotContractsRelatesToDiscontinuedOperations
Namespace Prefix:	crh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant