Benefit Plans - Sirius XM Holdings Inc. Deferred Compensation Plan (Narrative) (Details) - USD ($) $ in Millions |
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
Dec. 31, 2024 |
|
| Retirement Benefits [Abstract] | |||
| Contributions to the DCP, net of withdrawals | $ (3) | ||
| Contributions to the DCP | $ 2 | ||
| Fair value of investment assets related to deferred compensation plan | 55 | $ 60 | |
| Gains (losses) on investments | $ (2) | $ 3 | |