Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

v3.20.2
Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2020
Jul. 15, 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 001-36713  
Entity Registrant Name LIBERTY BROADBAND CORPORATION  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 47-1211994  
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 875-5700  
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  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q2  
Entity Central Index Key 0001611983  
Amendment Flag false  
Series A common stock    
Document Information [Line Items]    
Title of 12(b) Security Series A common stock  
Trading Symbol LBRDA  
Security Exchange Name NASDAQ  
Entity Common Stock, Shares Outstanding   26,495,123
Series B common stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   2,451,119
Series C common stock    
Document Information [Line Items]    
Title of 12(b) Security Series C common stock  
Trading Symbol LBRDK  
Security Exchange Name NASDAQ  
Entity Common Stock, Shares Outstanding   152,983,879