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Segment information - Reconciliation of Assets (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Segment Reporting Information [Line Items]
Assets	$ 23,782	$ 23,805
Operating Segments
Segment Reporting Information [Line Items]
Assets	22,747	21,293
Operating Segments | Building Materials
Segment Reporting Information [Line Items]
Assets	15,392	14,306
Operating Segments | Building Envelope
Segment Reporting Information [Line Items]
Assets	7,355	6,987
Reconciling items
Segment Reporting Information [Line Items]
Assets	$ 1,035	$ 2,512

X

- Definition

Amount of asset recognized for present right to economic benefit.

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