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Income taxes - Schedule of Valuation Allowance - (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Valuation Allowance [Roll Forward] |  |  |
Balance at January 1 | $ 737 | $ 578 | $ 507
Provision for income taxes | 151 | 203 | 102
Foreign currency and other | 26 | (44) | (31)
Balance at December 31 | $ 914 | $ 737 | $ 578

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- Definition Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Foreign Currency, Amount + References No definition available. + Details
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Namespace Prefix: | crh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Income Tax Provision, Amount + References No definition available. + Details
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Namespace Prefix: | crh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Valuation Allowance + References No definition available. + Details
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Namespace Prefix: | crh_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | instant