Earnings per share (EPS) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Earnings Per Share [Abstract]
Net income	$ 1,519	$ 1,389	$ 2,753	$ 2,812
Net (income) attributable to redeemable noncontrolling interests	(10)	(9)	(18)	(21)
Net (income) attributable to noncontrolling interests	(6)	(4)	(7)	(2)
Adjustment of redeemable noncontrolling interests to redemption value	(7)	(23)	(20)	(30)
Net Income (Loss) Available to Common Stockholders, Diluted, Total	1,496	1,353	2,708	2,759
Net income attributable to CRH plc for EPS, basic	$ 1,496	$ 1,353	$ 2,708	$ 2,759
Denominator
Weighted average common shares outstanding, basic (in shares)	672,300,000	681,600,000	674,400,000	685,000,000.0
Effect of dilutive employee share awards (in shares)	3,200,000	3,900,000	3,800,000	5,000,000.0
Weighted average common shares outstanding, diluted (in shares)	675,500,000	685,500,000	678,200,000	690,000,000.0
Earnings per share attributable to CRH plc, basic (in USD per share)	$ 2.23	$ 1.99	$ 4.02	$ 4.03
Earnings per share attributable to CRH plc, diluted (in USD per share)	$ 2.21	$ 1.97	$ 3.99	$ 4.00
Antidilutive securities excluded from computation of earnings per share (in shares)			3,184,287	3,919,037