Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - SIRIUS XM Holdings (Details)

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Stock-Based Compensation - SIRIUS XM Holdings (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Stock-Based Compensation      
Stock-based compensation expense $ 312.0 $ 192.0 $ 230.0
Total unrecognized compensation cost related to unvested equity awards $ 34.0    
Weighted average period of recognition related to unvested equity awards (in years) 2 years 1 month 6 days    
Sirius XM Holdings      
Stock-Based Compensation      
Stock-based compensation expense $ 229.0 $ 133.0 $ 124.0
Sirius XM Holdings | Pandora      
Stock-Based Compensation      
Stock-based compensation expense $ 21.0    
Sirius XM Holdings | Employee Stock Option      
Stock-Based Compensation      
Term of option 10 years    
Weighted average volatility rate 26.00% 23.00% 24.00%
Granted 15.0    
Granted, WAEP $ 6.10    
Weighted average GDFV $ 1.26    
Outstanding options 208.0    
Exercisable options 148.0    
Outstanding WAEP $ 4.46    
Exercisable WAEP $ 3.96    
Aggregate intrinsic value, outstanding $ 560.0    
Aggregate intrinsic value, exercisable 472.0    
Total unrecognized compensation cost related to unvested equity awards $ 415.0    
Weighted average period of recognition related to unvested equity awards (in years) 2 years 4 months 24 days    
Sirius XM Holdings | Employee Stock Option | Minimum      
Stock-Based Compensation      
Vesting period 3 years    
Sirius XM Holdings | Employee Stock Option | Maximum      
Stock-Based Compensation      
Vesting period 4 years    
Sirius XM Holdings | Restricted Stock      
Stock-Based Compensation      
RSUs granted 38.0    
RSUs GDFV $ 6.01    
Sirius XM Holdings | Restricted Stock | Pandora      
Stock-Based Compensation      
RSUs granted 48.0    
RSUs GDFV $ 5.83