Benefit Plans - Sirius XM Holdings Inc. Deferred Compensation Plan (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2019 |
Mar. 31, 2018 |
|
| Retirement Benefits [Abstract] | ||
| Deferred compensation contributions | $ 6 | $ 7 |
| Fair value of investment assets related to deferred compensation plan | 30 | 22 |
| Unrealized gains (losses) on investments | $ 0 | $ 0 |
| X | ||||||||||
- Definition Deferred Compensation Arrangement with Individual, Unrealized Gain (Loss) on Investment No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of contributions made by employer into fund established for purposes of making future disbursement to individual in accordance with deferred compensation arrangement. No definition available.
|
| X | ||||||||||
- Definition Carrying amount as of the balance sheet date of assets held under deferred compensation agreements. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|