Benefit Plans - Sirius XM Holdings Inc. Deferred Compensation Plan (Narrative) (Details) - USD ($) $ in Millions |
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Dec. 31, 2025 |
|
| Retirement Benefits [Abstract] | |||
| Contributions to the DCP, net of withdrawals | $ (5) | $ (3) | |
| Fair value of investment assets related to deferred compensation plan | 50 | $ 56 | |
| Gains (losses) on investments | $ (2) | $ (2) | |
| X | ||||||||||
- Definition Deferred Compensation Arrangement with Individual, Contributions by Employer, Net Of Withdrawals No definition available.
|
| X | ||||||||||
- Definition Deferred Compensation Arrangement with Individual, Gain (Loss) on Investment No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Carrying amount as of the balance sheet date of assets held under deferred compensation agreements. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|