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Income taxes - Schedule of Valuation Allowance - (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Valuation Allowance [Roll Forward] |  |  |
Balance at January 1 | $ 914 | $ 737 | $ 578
Acquisitions | 12 | 0 | 0
Provision for income taxes | 188 | 151 | 203
Foreign currency and other | (55) | 26 | (44)
Balance at December 31 | $ 1,059 | $ 914 | $ 737

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

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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

X
- 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
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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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