v3.25.4
COVER
 12 Months Ended
Dec. 31, 2025
shares
Document Information [Line Items]  
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Document Period End Date Dec. 31, 2025
Current Fiscal Year End Date --12-31
Document Transition Report false
Document Shell Company Report false
Entity File Number 001-42394
Registrant Name Sunrise Communications AG
Entity Incorporation, State or Country Code V8
Entity Address, Address Line One Thurgauerstrasse 101b
Entity Address, Postal Zip Code 8152
Entity Address, City or Town Glattpark (Opfikon)
Entity Address, Country CH
Title of 12(b) Security Class A common shares, nominal value CHF 0.1 per share (Namenaktien)
No Trading Symbol Flag true
Entity Well-known Seasoned Issuer No
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Large Accelerated Filer
Entity Emerging Growth Company false
ICFR Auditor Attestation Flag true
Document Financial Statement Error Correction [Flag] false
Document Accounting Standard International Financial Reporting Standards
Entity Shell Company false
Amendment Flag false
Entity Central Index Key 0002021938
Document Fiscal Period Focus FY
Document Fiscal Year Focus 2025
Business Contact  
Document Information [Line Items]  
Contact Personnel Name Marcel Huber
Entity Address, Address Line One Thurgauerstrasse 101b
Entity Address, Postal Zip Code 8152
Entity Address, City or Town Glattpark (Opfikon)
Entity Address, Country CH
Country Region 41
Local Phone Number 58 777 76 66
Class A Common Shares  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 70,108,614
Class B Shares with Privileged Voting Rights  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 25,805,386