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Segment information - Summary of key performance measures by segments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Revenue	$ 6,756	$ 6,533
Less:
Cost, Direct Labor	1,786	1,647
Energy costs	392	394
Other segment items	4,083	4,047
Adjusted EBITDA	495	445
Americas Materials Solutions
Segment Reporting Information [Line Items]
Revenue	2,243	2,202
Less:
Cost, Direct Labor	754	708
Energy costs	140	136
Other segment items	1,290	1,343
Adjusted EBITDA	59	15
Americas Building Solutions
Segment Reporting Information [Line Items]
Revenue	1,682	1,693
Less:
Cost, Direct Labor	375	357
Energy costs	32	32
Other segment items	988	996
Adjusted EBITDA	287	308
International Solutions
Segment Reporting Information [Line Items]
Revenue	2,831	2,638
Less:
Cost, Direct Labor	657	582
Energy costs	220	226
Other segment items	1,805	1,708
Adjusted EBITDA	$ 149	$ 122

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