v3.25.4
REVENUE FROM CONTRACTS WITH CUSTOMERS - Performance Obligations Satisfied or Partially Satisfied in Previous Periods (Details)
SFr in Millions
Dec. 31, 2025
CHF (SFr)
Within 1 year  
Disclosure of transaction price allocated to remaining performance obligations [line items]  
Telecommunications services (mobile and fixed) SFr 47.7
Between 1 and 2 years  
Disclosure of transaction price allocated to remaining performance obligations [line items]  
Telecommunications services (mobile and fixed) 34.2
Between 2 and 3 years  
Disclosure of transaction price allocated to remaining performance obligations [line items]  
Telecommunications services (mobile and fixed) SFr 19.9