Annual report pursuant to Section 13 and 15(d)

Benefit Plans - 401(k) Savings Plan (Details)

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Benefit Plans - 401(k) Savings Plan (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Sirius XM Savings Plan      
Defined Benefit Plan Disclosure [Line Items]      
Minimum of employee contributions of pre-tax eligible earnings to company 401(k) savings plan 1.00%    
Maximum of employee contributions of pre-tax eligible earnings to company 401(k) savings plan 50.00%    
Percent of Company match of employee's voluntary contributions 50.00%    
Percent of employee's pre-tax salary 6.00%    
Maximum annual contributions per employee, percent 3.00%    
Vesting percentage of employer contributions for each year of employment 33.33%    
Savings plan, fully vested period 3 years    
Pandora Plan      
Defined Benefit Plan Disclosure [Line Items]      
Minimum of employee contributions of pre-tax eligible earnings to company 401(k) savings plan 1.00%    
Maximum of employee contributions of pre-tax eligible earnings to company 401(k) savings plan 75.00%    
Percent of Company match of employee's voluntary contributions 50.00%    
Percent of employee's pre-tax salary 6.00%    
Maximum annual contributions per employee, percent 3.00%    
Recognized cost $ 16 $ 9 $ 9