Annual report pursuant to Section 13 and 15(d)

Stock Options and Other Share-Based Awards Stock Options and Other Share-Based Awards (Restricted Stock Activity) (Details)

v3.8.0.1
Stock Options and Other Share-Based Awards Stock Options and Other Share-Based Awards (Restricted Stock Activity) (Details) - Liberty Incentive Plan - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
QVCA      
Restricted shares      
Outstanding at beginning of the year (in shares) 907,826    
Granted (in shares) 677,376    
Transferred from zulily (in shares) 21,630    
Lapsed (in shares) (391,330)    
Forfeited (in shares) (127,526)    
Outstanding at end of the year (in shares) 1,087,976 907,826  
Weighted average grant fair value      
Outstanding at beginning of the year (in dollars per share) $ 26.65    
Granted (in dollars per share) 22.49 $ 25.86 $ 29.22
Transferred from zulily (in dollars per share) 25.16    
Lapsed (in dollars per share) 25.98    
Forfeited (in dollars per share) 25.72    
Outstanding at end of the year (in dollars per share) $ 24.38 $ 26.65  
LVNTA      
Restricted shares      
Outstanding at beginning of the year (in shares) 13,892    
Granted (in shares) 0    
Lapsed (in shares) (9,153)    
Forfeited (in shares) (678)    
Outstanding at end of the year (in shares) 4,061 13,892  
Weighted average grant fair value      
Outstanding at beginning of the year (in dollars per share) $ 46.57    
Granted (in dollars per share) 0.00    
Lapsed (in dollars per share) 44.14    
Forfeited (in dollars per share) 50.01    
Outstanding at end of the year (in dollars per share) $ 51.47 $ 46.57