OTHER OPERATING INCOME AND EXPENSES - Additional Information (Details) - CHF (SFr) SFr in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Disclosure of attribution of expenses by nature to their function [line items] | |||
| Increase (decrease) in professional fees expense | SFr (14.5) | SFr (27.6) | |
| Other | 4.6 | 2.5 | SFr 66.1 |
| Broadcasting Rights Penalty | |||
| Disclosure of attribution of expenses by nature to their function [line items] | |||
| Other | 29.1 | ||
| Restructuring obligations | |||
| Disclosure of attribution of expenses by nature to their function [line items] | |||
| Other | SFr 28.5 | ||
| Network Related Cost | |||
| Disclosure of attribution of expenses by nature to their function [line items] | |||
| Increase (decrease) in professional fees expense | (28.9) | ||
| Intercompany-Related | |||
| Disclosure of attribution of expenses by nature to their function [line items] | |||
| Increase (decrease) in professional fees expense | SFr (19.0) | SFr 20.4 | |