v3.26.1
Document and Entity Information - shares
3 Months Ended
Mar. 31, 2026
Apr. 30, 2026
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2026  
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  
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  
City Area Code 720  
Local Phone Number 875-5900  
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  
Entity Shell Company false  
Entity Central Index Key 0002057463  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
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   35,853,250