Acquisitions - Narrative (Details) $ in Millions				12 Months Ended
	Sep. 15, 2025 USD ($)	Jul. 01, 2024 USD ($)	Feb. 09, 2024 USD ($)	Dec. 31, 2025 USD ($) acquisition	Dec. 31, 2024 USD ($) acquisition	Dec. 31, 2023 USD ($)
Business Combination [Line Items]
Acquisitions, net of cash acquired				$ 3,856	$ 4,900	$ 640
Goodwill				13,099	11,061	9,158
Revenue of acquiree since acquisition date				755	1,387	228
Net (loss) income attributable to CRH plc				10	$ 23	$ 15
Eco Material Technologies (Eco Material)
Business Combination [Line Items]
Acquisitions, net of cash acquired	$ 2,066			2,066
Intangible assets, net				789
Goodwill				$ 775
Other acquisitions
Business Combination [Line Items]
Number of acquisitions | acquisition				37	38
Acquisitions, net of cash acquired				$ 1,790	$ 2,007
Intangible assets, net				123	184
Goodwill				1,045	940
2025 Acquisitions
Business Combination [Line Items]
Acquisitions, net of cash acquired				3,856
Intangible assets, net				912
Goodwill				1,820
Goodwill expected tax deductible amount				$ 1,332
Intangible assets acquired, weighted average useful life				18 years
Hunter
Business Combination [Line Items]
Acquisitions, net of cash acquired			$ 2,106		2,106
Intangible assets, net					2
Goodwill					977
Adbri
Business Combination [Line Items]
Acquisitions, net of cash acquired		$ 787			787
Intangible assets, net					4
Goodwill					227
Business acquisition, percentage of voting interests acquired		57.00%
2024 Acquisitions
Business Combination [Line Items]
Acquisitions, net of cash acquired					4,900
Intangible assets, net					190
Goodwill					2,144
Goodwill expected tax deductible amount					$ 1,712
Intangible assets acquired, weighted average useful life					9 years