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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, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
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 | $ 3 | $ 5 | $ 14 | $ 16

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