v3.25.4
SUBSIDIAIRIES AND ASSOCIATES (Details)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
CH Media TV AG    
Disclosure of associates [line items]    
Proportion of ownership interest in associate 20.00% 20.00%
Proportion of voting rights held in associate 20.00% 20.00%
ITV Betriebsgesellschaft GmbH    
Disclosure of associates [line items]    
Proportion of ownership interest in associate 50.00% 50.00%
Proportion of voting rights held in associate 50.00% 50.00%
Naxoo S.A    
Disclosure of associates [line items]    
Proportion of ownership interest in associate 48.80% 48.80%
Proportion of voting rights held in associate 48.80% 48.80%
REGIONALE GEMEINSCHAFTSANTENNEN-ANLAGE SPIEZ AG REGAS    
Disclosure of associates [line items]    
Proportion of ownership interest in associate 30.00% 30.00%
Proportion of voting rights held in associate 30.00% 30.00%
Swiss-Ski Store GmbH    
Disclosure of associates [line items]    
Proportion of ownership interest in associate 50.00% 50.00%
Proportion of voting rights held in associate 50.00% 50.00%
TELDAS GmbH    
Disclosure of associates [line items]    
Proportion of ownership interest in associate 23.00% 23.00%
Proportion of voting rights held in associate 23.00% 23.00%
ello communications S.A.    
Disclosure of associates [line items]    
Proportion of ownership interests held by non-controlling interests 60.00% 60.00%
Proportion of voting rights held by non-controlling interests 60.00% 60.00%
Sitel S.A.    
Disclosure of associates [line items]    
Proportion of ownership interests held by non-controlling interests 66.70% 66.70%
Proportion of voting rights held by non-controlling interests 66.70% 66.70%
Sunrise Financing Partnership    
Disclosure of associates [line items]    
Proportion of ownership interests held by non-controlling interests 100.00% 100.00%
Proportion of voting rights held by non-controlling interests 100.00% 100.00%
Sunrise FinCo I B.V.    
Disclosure of associates [line items]    
Proportion of ownership interests held by non-controlling interests 100.00% 100.00%
Proportion of voting rights held by non-controlling interests 100.00% 100.00%
Sunrise FinCo II B.V.    
Disclosure of associates [line items]    
Proportion of ownership interests held by non-controlling interests 100.00% 100.00%
Proportion of voting rights held by non-controlling interests 100.00% 100.00%
Sunrise GmbH    
Disclosure of associates [line items]    
Proportion of ownership interests held by non-controlling interests 100.00% 100.00%
Proportion of voting rights held by non-controlling interests 100.00% 100.00%
Sunrise HoldCo I B.V.    
Disclosure of associates [line items]    
Proportion of ownership interests held by non-controlling interests 100.00% 100.00%
Proportion of voting rights held by non-controlling interests 100.00% 100.00%
Sunrise HoldCo II B.V.    
Disclosure of associates [line items]    
Proportion of ownership interests held by non-controlling interests 100.00% 100.00%
Proportion of voting rights held by non-controlling interests 100.00% 100.00%
Sunrise HoldCo III B.V.    
Disclosure of associates [line items]    
Proportion of ownership interests held by non-controlling interests 100.00% 100.00%
Proportion of voting rights held by non-controlling interests 100.00% 100.00%
Sunrise HoldCo IV B.V.    
Disclosure of associates [line items]    
Proportion of ownership interests held by non-controlling interests 100.00% 100.00%
Proportion of voting rights held by non-controlling interests 100.00% 100.00%
Sunrise HoldCo V B.V.    
Disclosure of associates [line items]    
Proportion of ownership interests held by non-controlling interests 100.00% 100.00%
Proportion of voting rights held by non-controlling interests 100.00% 100.00%
Sunrise HoldCo VI B.V.    
Disclosure of associates [line items]    
Proportion of ownership interests held by non-controlling interests 100.00% 100.00%
Proportion of voting rights held by non-controlling interests 100.00% 100.00%
Sunrise Portugal S.A.    
Disclosure of associates [line items]    
Proportion of ownership interests held by non-controlling interests 100.00% 100.00%
Proportion of voting rights held by non-controlling interests 100.00% 100.00%
Swiss Open Fiber AG    
Disclosure of associates [line items]    
Proportion of ownership interests held by non-controlling interests 100.00% 100.00%
Proportion of voting rights held by non-controlling interests 100.00% 100.00%
Télédistal S.A.    
Disclosure of associates [line items]    
Proportion of ownership interests held by non-controlling interests 38.90% 38.90%
Proportion of voting rights held by non-controlling interests 38.90% 38.90%
Télédistal S.A. | Sitel S.A.    
Disclosure of associates [line items]    
Proportion of ownership interests held by non-controlling interests 58.30%  
Proportion of voting rights held by non-controlling interests 58.30%  
Télévaux S.A.    
Disclosure of associates [line items]    
Proportion of ownership interests held by non-controlling interests 80.00% 80.00%
Proportion of voting rights held by non-controlling interests 80.00% 80.00%
UPCB Finance VII Limited    
Disclosure of associates [line items]    
Proportion of ownership interests held by non-controlling interests 0.00% 0.00%
Proportion of voting rights held by non-controlling interests 0.00% 0.00%