Segment information - Consolidated Balance Sheet (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025	Jun. 30, 2025
Segment Reporting [Line Items]
Total assets for reportable segments	$ 58,552	$ 58,329	$ 53,984
Operating Segments
Segment Reporting [Line Items]
Total assets for reportable segments	54,556	53,229	49,929
Americas Materials Solutions \| Operating Segments
Segment Reporting [Line Items]
Total assets for reportable segments	26,574	25,396	22,993
Americas Building Solutions \| Operating Segments
Segment Reporting [Line Items]
Total assets for reportable segments	10,081	9,712	9,838
International Solutions \| Operating Segments
Segment Reporting [Line Items]
Total assets for reportable segments	$ 17,901	$ 18,121	$ 17,098

Amount of asset recognized for present right to economic benefit.

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+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details