Quarterly report pursuant to Section 13 or 15(d)

Cover Page

v3.20.2
Cover Page - shares
 6 Months Ended
Jun. 30, 2020
Jul. 31, 2020
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2020  
Document Transition Report false  
Entity File Number 001-38385  
Entity Registrant Name GCI LIBERTY, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 92-0072737  
Entity Address, Address Line One 12300 Liberty Boulevard  
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 Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Amendment Flag false  
Entity Central Index Key 0000808461  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q2  
Series A common stock    
Document Information [Line Items]    
Title of 12(b) Security Series A Common Stock  
Trading Symbol GLIBA  
Security Exchange Name NASDAQ  
Entity Common Stock, Shares Outstanding   101,325,219
Series A Cumulative Redeemable Preferred Stock    
Document Information [Line Items]    
Title of 12(b) Security Series A Cumulative Redeemable preferred stock  
Trading Symbol GLIBP  
Security Exchange Name NASDAQ  
Series B common stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   4,488,674