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Benefit Plans - 401(k) Savings Plan (Details) - Sirius XM Savings Plan - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
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 |
Recognized cost | $ 2 | $ 2

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- Definition Employees contribution of their pretax earnings to subsidiary plan minimum. + References No definition available. + Details
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- Details
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