Segment information - Schedule of gain or loss on disposal of business (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment information - Consolidated Balance Sheet
Total gain on divestitures and investments	$ 1	$ 250	$ 0
Americas Materials Solutions
Segment information - Consolidated Balance Sheet
Total gain on divestitures and investments	19	0	0
Americas Building Solutions
Segment information - Consolidated Balance Sheet
Total gain on divestitures and investments	0	1	0
International Solutions
Segment information - Consolidated Balance Sheet
Total gain on divestitures and investments	$ (18)	$ 249	$ 0