Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation (Details)

v3.10.0.1
Basis of Presentation (Details)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Oct. 17, 2018
USD ($)
Dec. 29, 2017
shares
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Mar. 09, 2018
item
Severance Costs $ 43            
Number Of Tracking Stock | item             2
LMC              
Related Party Transaction, Amounts of Transaction     $ 2 $ 3 $ 6 $ 8  
Additional Paid-In Capital              
Reclassification         $ 3,894    
HSNi              
Business Acquisition, Percentage of Voting Interests Acquired   62.00%          
QVC Group | HSNi              
Business Acquisition Equity Interests Issued or Issuable Number Of Shares Issued Per Shares Acquired   1.65          
QVC Group | HSNi | Common Class A              
Stock Issued During Period Shares Acquisitions] | shares   53.6          
Liberty Ventures common stock | Common Class A              
Share exchange ratio             1
Liberty Ventures common stock | Common Class B              
Share exchange ratio             1