v3.25.4
EMPLOYEE BENEFIT OBLIGAITONS - Sensitivity Analysis (Details)
SFr in Millions
Dec. 31, 2025
CHF (SFr)
Discount rate (0.5% movement)  
Disclosure of net defined benefit liability (asset) [line items]  
Percentage of reasonably possible increase in actuarial assumption 0.50%
Percentage of reasonably possible decrease in actuarial assumption 0.50%
Reasonably possible increase in actuarial assumption SFr 781.9
Reasonably possible decrease in actuarial assumption SFr 887.1
Future salary increases (1.0% movement)  
Disclosure of net defined benefit liability (asset) [line items]  
Percentage of reasonably possible increase in actuarial assumption 1.00%
Percentage of reasonably possible decrease in actuarial assumption 1.00%
Reasonably possible increase in actuarial assumption SFr 842.9
Reasonably possible decrease in actuarial assumption SFr 822.2
Interest crediting rate (0.5% movement)  
Disclosure of net defined benefit liability (asset) [line items]  
Percentage of reasonably possible increase in actuarial assumption 0.50%
Percentage of reasonably possible decrease in actuarial assumption 0.50%
Reasonably possible increase in actuarial assumption SFr 842.3
Reasonably possible decrease in actuarial assumption SFr 820.5