Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Narrative) (Details)

v3.10.0.1
Stock-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Stock-based compensation   $ 88.0 $ 123.0 $ 97.0
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate   0.00%    
Total unrecognized compensation cost related to unvested Liberty equity awards   $ 71.0    
Weighted average period of recognition related to unvested equity awards (in years)   1 year 8 months 12 days    
Common Stock, Capital Shares Reserved for Future Issuance   30,300    
Number of shares reserved for issuance   39,900    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value   $ 28.0 145.0 44.0
Share-based Compensation Expense   88.0 123.0 97.0
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value   $ 64.0 $ 23.0 $ 26.0
Common Class A        
Common Stock, Capital Shares Reserved for Future Issuance   28,400    
Options granted   4,768    
Common Class B        
Common Stock, Capital Shares Reserved for Future Issuance   1,800    
Options granted   175    
QVC Employees | Common Class A        
Options granted   2,924 3,115 2,860
Weighted average grant-date fair value of options   $ 8.76 $ 7.86 $ 7.84
Award vesting period   4 years    
zulily Employees | Common Class A        
Options granted   336 483 433
Weighted average grant-date fair value of options   $ 8.65 $ 7.86 $ 7.57
Award vesting period   4 years    
HSN Employees | Common Class A        
Options granted   859    
Weighted average grant-date fair value of options   $ 8.77    
Award vesting period   4 years    
Liberty Employees | Common Class A        
Options granted   72 518 421
Weighted average grant-date fair value of options   $ 7.31 $ 7.81 $ 8.02
Qurate Retail President and CEO | Common Class A        
Options granted   577    
Weighted average grant-date fair value of options   $ 7.09    
Qurate Retail Chairman Of Board | Common Class B        
Options granted   175 154 730
Weighted average grant-date fair value of options   $ 8.84 $ 7.92 $ 7.47
QVC CEO | Common Class A | Awards subject to Fifty Percent Vesting        
Award Vesting Period Percentage   50.00%    
Liberty directors | Common Class A        
Award vesting period   1 year    
Minimum        
Award vesting period   4 years    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   7 years    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term   2 years 2 years 2 years
Minimum | Liberty Employees | Common Class A        
Award vesting period   3 years    
Maximum        
Award vesting period   5 years    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term   6 years 4 months 24 days 6 years 4 months 24 days 6 years 4 months 24 days
Maximum | Liberty Employees | Common Class A        
Award vesting period   5 years    
QVC Group | Common Class A | Restricted Stock        
Nonvested awards, number   4,200    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value   $ 24.28    
Liberty Ventures common stock | Common Class B        
Options granted   143    
Liberty Ventures common stock | Liberty Employees | Common Class A        
Options granted     188 114
Weighted average grant-date fair value of options     $ 16.52 $ 12.25
Liberty Ventures common stock | Qurate Retail Chairman Of Board | Common Class B        
Options granted   143 269 209
Weighted average grant-date fair value of options   $ 16.55 $ 15.41 $ 12.48
Liberty Ventures common stock | Liberty directors | Common Class A        
Award vesting period   1 year    
Liberty Ventures common stock | Minimum | Liberty Employees | Common Class A        
Award vesting period   3 years    
Liberty Ventures common stock | Maximum | Liberty Employees | Common Class A        
Award vesting period   5 years    
CommerceHub        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities Paid       $ 90.0
Option exchange        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value     $ 104.0  
Unamortized value of unvested eligible options   $ 14.0    
Option exchange | QVC Group | Common Class A        
Options granted   5,900    
Weighted average grant-date fair value of options   $ 3.49    
Option exchange | Liberty Ventures common stock | Common Class A        
Options granted   946    
Weighted average grant-date fair value of options   $ 8.53    
Option exchange | Liberty Ventures common stock | Common Class B        
Options granted   1,100    
Weighted average grant-date fair value of options   $ 6.94    
Option exchange | GCI Liberty        
Share-based Compensation Expense   $ 5.8    
Unamortized value of unvested eligible options   6.0    
Unvested New Options member        
Share-based Compensation Expense   $ 6.0    
New vested option member        
Share-based Compensation Expense $ 30.0      
Chairman | QVC Group | Common Class B | Restricted Stock        
Options granted   124 115 53
Weighted average grant-date fair value of options   $ 27.56 $ 19.90 $ 25.11
Award vesting period   1 year    
Chairman | Liberty Ventures common stock | Common Class B | Restricted Stock        
Options granted       16
Weighted average grant-date fair value of options       $ 38.79
Award vesting period   1 year