EARNINGS PER SHARE - Schedule of Antidilutive Shares (Details) - SFr / shares |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Earnings per share [line items] | ||
| Number of potential ordinary shares that are antidilutive in period presented (in shares) | 1,808,952 | 2,287,331 |
| PSUs | ||
| Earnings per share [line items] | ||
| Number of potential ordinary shares that are antidilutive in period presented (in shares) | 690,536 | 421,608 |
| RSUs | ||
| Earnings per share [line items] | ||
| Number of potential ordinary shares that are antidilutive in period presented (in shares) | 389,563 | 399,399 |
| SARs | ||
| Earnings per share [line items] | ||
| Number of potential ordinary shares that are antidilutive in period presented (in shares) | 73,772 | 63,814 |
| Weighted average share price (in SFr per share) | SFr 42.42 | SFr 39.32 |
| Legacy LG RSU plans | ||
| Earnings per share [line items] | ||
| Number of potential ordinary shares that are antidilutive in period presented (in shares) | 655,081 | 1,402,510 |