Benefit Plans - Sirius XM Holdings Inc. Deferred Compensation Plan (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Retirement Benefits [Abstract] | |||
| Deferred compensation contributions | $ 8 | $ 7 | $ 8 |
| Fair value of investment assets related to deferred compensation plan | 46 | 34 | |
| Gains (losses) on investments | $ 3 | $ 3 | |
| X | ||||||||||
- Definition Deferred Compensation Arrangement with Individual, 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
|