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Acquisitions - Narrative (Details) $ in Millions	3 Months Ended
Acquisitions - Narrative (Details) $ in Millions	Mar. 31, 2025 USD ($) acquisition	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Business Acquisition [Line Items]
Payments to acquire businesses	$ 585	$ 2,206
Goodwill	11,475	10,125	$ 11,061	$ 9,158
Business acquisition, goodwill, expected tax deductible amount	$ 327
Acquired finite-lived intangible assets, weighted average useful life	5 years
Business combination, pro forma information, revenue of acquiree since acquisition date, actual	$ 28	57
Net loss attributable to CRH plc	$ 9	$ 9
Other acquisitions
Business Acquisition [Line Items]
Number of businesses acquired \| acquisition	8
Payments to acquire businesses	$ 585
Intangible assets, net	21
Goodwill	$ 340