Quarterly report pursuant to Section 13 or 15(d)

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

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Benefit Plans - 401(k) Savings Plan (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
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  
Sirius XM And Pandora Plans        
Defined Benefit Plan Disclosure [Line Items]        
Recognized cost $ 4 $ 4    
Pandora Plan        
Defined Benefit Plan Disclosure [Line Items]        
Recognized cost     $ 17 $ 12