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Benefit Plans - 401(k) Savings Plan (Narrative) (Details) - Sirius XM Savings Plan - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
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 | $ 5 | $ 5 | $ 16 | $ 16

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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 Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480794/715-70-50-1 + 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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