Benefit Plans - 401(k) Savings Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
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]
Recognized cost	$ 21	$ 16	$ 9