Segment information - Summary of key performance measures by segments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Revenues	$ 10,515	$ 10,128	$ 26,702	$ 26,264
Adjusted EBITDA	2,454	2,190	5,154	4,590
Americas Materials Solutions
Segment Reporting Information [Line Items]
Revenues	5,299	5,080	11,907	11,139
Adjusted EBITDA	1,484	1,284	2,692	2,184
Americas Building Solutions
Segment Reporting Information [Line Items]
Revenues	1,757	1,738	5,566	5,547
Adjusted EBITDA	355	391	1,139	1,166
Europe Materials Solutions
Segment Reporting Information [Line Items]
Revenues	2,795	2,617	7,212	7,409
Adjusted EBITDA	553	446	1,142	1,029
Europe Building Solutions
Segment Reporting Information [Line Items]
Revenues	664	693	2,017	2,169
Adjusted EBITDA	$ 62	$ 69	$ 181	$ 211