Segment information - Consolidated Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024
Segment Reporting Information [Line Items]
Total assets for reportable segments	$ 51,921	$ 50,613	$ 46,333
Operating Segments
Segment Reporting Information [Line Items]
Total assets for reportable segments	47,294	45,534	41,669
Americas Materials Solutions | Operating Segments
Segment Reporting Information [Line Items]
Total assets for reportable segments	21,715	21,474	19,860
Americas Building Solutions | Operating Segments
Segment Reporting Information [Line Items]
Total assets for reportable segments	9,786	9,049	8,821
International Solutions | Operating Segments
Segment Reporting Information [Line Items]
Total assets for reportable segments	$ 15,793	$ 15,011	$ 12,988