Annual report pursuant to Section 13 and 15(d)

Stock Options and Other Share-Based Awards Stock Options and Other Share- Based Awards (Narrative) (Details)

v3.8.0.1
Stock Options and Other Share-Based Awards Stock Options and Other Share- Based Awards (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation $ 31 $ 32 $ 31
Liberty Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Intrinsic value of options exercised during period 32 28 60
Unrecognized compensation cost related to options $ 44    
Unrecognized compensation cost, period for recognition 2 years 8 months    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value $ 10 8 7
Liberty Incentive Plan | Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation 21 21 24
Liberty Incentive Plan | Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation 10 $ 11 $ 7
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options $ 17    
Unrecognized compensation cost, period for recognition 2 years 5 months    
Liberty Incentive Plan | QVCA      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant date fair value of options granted during period $ 7.86 $ 7.84 $ 11.20
Granted (in dollars per share) $ 22.49 $ 25.86 $ 29.22