Segment information - Summary of key performance measures by segments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Revenue	$ 7,370	$ 6,756
Less:
Labor	1,927	1,786
Energy costs	421	392
Other segment items	4,436	4,083
Adjusted EBITDA	586	495
Americas Materials Solutions
Segment Reporting Information [Line Items]
Revenue	2,724	2,243
Less:
Labor	847	754
Energy costs	150	140
Other segment items	1,624	1,290
Adjusted EBITDA	103	59
Americas Building Solutions
Segment Reporting Information [Line Items]
Revenue	1,668	1,682
Less:
Labor	375	375
Energy costs	35	32
Other segment items	971	988
Adjusted EBITDA	287	287
International Solutions
Segment Reporting Information [Line Items]
Revenue	2,978	2,831
Less:
Labor	705	657
Energy costs	236	220
Other segment items	1,841	1,805
Adjusted EBITDA	$ 196	$ 149