Segment information - Summary of key performance measures by segments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Revenue	$ 11,069	$ 10,515	$ 28,031	$ 26,702
Less:
Labor	2,079	1,975	5,846	5,479
Energy costs	522	507	1,411	1,371
Other segment items	5,773	5,579	15,121	14,698
Adjusted EBITDA	2,695	2,454	5,653	5,154
Americas Materials Solutions
Segment Reporting Information [Line Items]
Revenue	5,637	5,299	12,389	11,907
Less:
Labor	1,036	978	2,738	2,604
Energy costs	233	220	581	556
Other segment items	2,813	2,617	6,215	6,055
Adjusted EBITDA	1,555	1,484	2,855	2,692
Americas Building Solutions
Segment Reporting Information [Line Items]
Revenue	1,797	1,757	5,638	5,566
Less:
Labor	372	367	1,132	1,088
Energy costs	31	29	95	93
Other segment items	962	1,006	3,191	3,246
Adjusted EBITDA	432	355	1,220	1,139
International Solutions
Segment Reporting Information [Line Items]
Revenue	3,635	3,459	10,004	9,229
Less:
Labor	671	630	1,976	1,787
Energy costs	258	258	735	722
Other segment items	1,998	1,956	5,715	5,397
Adjusted EBITDA	$ 708	$ 615	$ 1,578	$ 1,323