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Earnings per share and shareholders' equity - Narrative (Details) - shares | Jun. 23, 2025 | Jun. 30, 2025
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Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |
Number of shares issued | 553,082,069 |
Number of common stock shares outstanding |  | 553,082,069
Number of treasury stock shares | 13,793,444 | 13,793,444
Holcim Ltd |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |
Number of common stock shares outstanding | 566,875,513 |

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