Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - SIRIUS XM (Details)

v3.8.0.1
Stock-Based Compensation - SIRIUS XM (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Weighted average period of recognition related to unvested equity awards (in years) 1 year 8 months 12 days    
Stock-based compensation $ 230.0 $ 150.0 $ 204.0
Total unrecognized compensation cost related to unvested equity awards $ 30.0    
SIRIUS XM      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Weighted average period of recognition related to unvested equity awards (in years) 2 years 6 months    
Stock-based compensation $ 124.0 $ 109.0 $ 157.0
SIRIUS XM | Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Options granted 27.3    
WAEP granted $ 5.49    
Outstanding options 280.5    
Exercisable options 131.0    
Outstanding WAEP $ 3.76    
Exercisable WAEP $ 3.23    
Outstanding options, aggregate intrinsic value $ 454.0    
Exercisable Options, Aggregate Intrinsic Value $ 279.1    
Weighted average grant-date fair value $ 1.17    
Weighted average volatility rate 24.00% 22.00% 29.00%
Total unrecognized compensation cost related to unvested equity awards $ 242.0    
SIRIUS XM | Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Restricted stock granted 11.7    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 5.35