Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

v2.4.1.9
Document and Entity Information (USD $)
12 Months Ended
Dec. 31, 2014
Jun. 30, 2014
Feb. 28, 2015
Entity Registrant Name Liberty Broadband Corp    
Entity Central Index Key 0001611983    
Document Type 10-K    
Document Period End Date Dec. 31, 2014    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Non-accelerated Filer    
Entity Public Float   $ 0dei_EntityPublicFloat  
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY    
Class A common stock      
Entity Common Stock, Shares Outstanding     26,126,943dei_EntityCommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Class B common stock      
Entity Common Stock, Shares Outstanding     2,467,547dei_EntityCommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Class C common stock      
Entity Common Stock, Shares Outstanding     74,468,091dei_EntityCommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember