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Benefit Plans - 401(k) Savings Plan (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 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 | $ 5 | $ 5

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- Definition Employees contribution of their pretax earnings to subsidiary plan maximum. + References No definition available. + Details
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- Definition Employees contribution of their pretax earnings to subsidiary plan minimum. + References No definition available. + Details
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- Definition Defined contribution plan, fully vested period. + References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Definition Percentage of employer's matching contributions to a defined contribution plan that vests in a given year. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Details
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- Details
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