v3.25.4

Organization and basis of presentation - Narrative (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2025 USD ($) segment shares | Dec. 31, 2024 USD ($) | Jun. 23, 2025 shares
Business Combination [Line Items] |  |  |
Number of reportable segments | segment | 2 |  |
Common stock, outstanding (in shares) | 553,082,525 |  | 566,875,513
Treasury stock (in shares) | 13,792,988 |  | 13,793,444
Related Party |  |  |
Business Combination [Line Items] |  |  |
Various transaction costs | $ | $ 11 | $ 15 |
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 (in shares) |  |  | 553,082,069

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