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v3.25.2

Organization and basis of presentation (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 USD ($) shares | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) segment shares | Jun. 30, 2024 USD ($) | Jun. 23, 2025 shares
Business Combination [Line Items] |  |  |  |  |
Number of reportable segments | segment |  |  | 2 |  |
Common stock, outstanding (in shares) | 553,082,069 |  | 553,082,069 |  |
Treasury stock (in shares) | 13,793,444 |  | 13,793,444 |  | 13,793,444
Various transaction costs | $ | $ 6 | $ 5 | $ 11 | $ 10 |
Holcim Ltd |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Common stock, outstanding (in shares) |  |  |  |  | 566,875,513
Holcim Ltd | Amrize Ltd | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Equity interest disposed |  |  |  |  | 100.00%
Number of shares issued |  |  |  |  | 553,082,069

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