Segment information - Schedule of gain or loss on disposal of business (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment information - Consolidated Balance Sheet
Total gain (loss) on divestitures and unrealized gains on investments	$ 250	$ 0	$ (99)
Americas Building Solutions
Segment information - Consolidated Balance Sheet
Total gain (loss) on divestitures and unrealized gains on investments	1	0	0
International Solutions
Segment information - Consolidated Balance Sheet
Total gain (loss) on divestitures and unrealized gains on investments	$ 249	$ 0	$ (99)