Accounting policies [line items]

No definition available.

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

- Definition

Carbon Emissions Target two thousand and twenty five Description

+ References

No definition available.

+ Details

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

- Definition

Percentage of awards granted.

+ References

No definition available.

+ Details

Name:	crh_PercentageOfAwardsGranted
Namespace Prefix:	crh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of depreciation rate.

+ References

No definition available.

+ Details

Name:	crh_PercentageOfDepreciationRate
Namespace Prefix:	crh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Total carrying value of property, plant and equipment as a percentage of total assets.

+ References

No definition available.

+ Details

Name:	crh_PercentageOfPropertyPlantEquipmentInAssets
Namespace Prefix:	crh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of reduction in carbondioxide levels.

+ References

No definition available.

+ Details

Name:	crh_PercentageOfReductionInCarbondioxideLevels
Namespace Prefix:	crh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Property plant and equipment excluding leased right of use assets.

+ References

No definition available.

+ Details

Name:	crh_PropertyPlantAndEquipmentExcludingLeasedRightOfUseAssets
Namespace Prefix:	crh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Reduction in carbondioxide level.

+ References

No definition available.

+ Details

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

- Definition

The depreciation rate used for property, plant and equipment. [Refer: Property, plant and equipment]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 16
-IssueDate 2021-01-01
-Paragraph 73
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_73_c&doctype=Standard
-URIDate 2021-03-24

+ Details

Name:	ifrs-full_DepreciationRatePropertyPlantAndEquipment
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The useful life, measured as period of time, used for property, plant and equipment. [Refer: Property, plant and equipment]

+ References

+ Details

Name:	ifrs-full_UsefulLifeMeasuredAsPeriodOfTimePropertyPlantAndEquipment
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	crh_MaterialAxis=crh_CementitiousMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	crh_VestingConditionAxis=crh_CumulativeCashFlowTargetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=crh_TSRMeasureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_MeasurementAxis=crh_TailoredSectorPeerGroupMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=crh_PlantAndMachineryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_VehiclesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_WeightedAverageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_BuildingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Accounting policies - Additional Information (Detail) - USD ($) $ in Millions			12 Months Ended
	Jan. 01, 2022	Aug. 31, 2021	Dec. 31, 2021
Accounting policies [line items]
Property, plant and equipment excluding leased right-of-use assets			$ 17,938
Property, plant and equipment as a % of assets			40.00%
Carbon emission 2025 target description			520kg of CO2 per tonne
Percentage of reduction in carbondioxide levels	25.00%
Cementitious [Member]
Accounting policies [line items]
Reduction in carbondioxide level		520
Cumulative Cash Flow Target [member]
Accounting policies [line items]
Percentage of awards granted			50.00%
TSR measure [member]
Accounting policies [line items]
Percentage of awards granted			25.00%
TSR measure [member] \| Tailored sector peer group [member]
Accounting policies [line items]
Percentage of awards granted			25.00%
Maximum [member]
Accounting policies [line items]
Useful life measured as period of time, property, plant and equipment			10 years
Plant and machinery [member] \| Minimum [member]
Accounting policies [line items]
Rate of depreciation			3.30%
Plant and machinery [member] \| Maximum [member]
Accounting policies [line items]
Rate of depreciation			20.00%
Transport [member] \| Average [member]
Accounting policies [line items]
Rate of depreciation			20.00%
Buildings [member]
Accounting policies [line items]
Rate of depreciation			2.50%