v3.25.4
Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2025
Jan. 31, 2026
Jun. 30, 2025
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Document Transition Report false    
Entity File Number 001-42742    
Entity Registrant Name GCI Liberty, Inc.    
Entity Incorporation, State or Country Code NV    
Entity Tax Identification Number 36-5128842    
City Area Code 720    
Local Phone Number 875-5900    
Entity Address, Address Line One 12300 Liberty Blvd.    
Entity Address, City or Town Englewood    
Entity Address State Or Province CO    
Entity Address, Postal Zip Code 80112    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company true    
Entity Ex Transition Period true    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 0
Auditor Name KPMG LLP    
Auditor Location Denver, Colorado    
Auditor Firm ID 185    
Entity Central Index Key 0002057463    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Amendment Flag false    
Series A GCI Group common stock      
Title of 12(b) Security Series A GCI Group common stock    
Trading Symbol GLIBA    
Security Exchange Name NASDAQ    
Entity Common Stock, Shares Outstanding   3,650,938  
Series B GCI Group common stock      
Entity Common Stock, Shares Outstanding   400,806  
Series C GCI Group common stock      
Title of 12(b) Security Series C GCI Group common stock    
Trading Symbol GLIBK    
Security Exchange Name NASDAQ    
Entity Common Stock, Shares Outstanding   35,756,905