Benefit Plans - Sirius XM Holdings Inc. Deferred Compensation Plan (Narrative) (Details) - USD ($) $ in Millions |
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2024 |
Mar. 31, 2023 |
Dec. 31, 2023 |
|
| Retirement Benefits [Abstract] | |||
| Net contributions | $ 2 | $ 1 | |
| Fair value of investment assets related to deferred compensation plan | 58 | $ 53 | |
| Gains (losses) on investments | $ 3 | $ 2 | |