| Benefit Plans - Sirius XM Holdings Inc. Deferred Compensation Plan (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended | ||
|---|---|---|---|
| Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | |
| Retirement Benefits [Abstract] | |||
| Contributions (withdrawals) | $ (3) | $ (1) | |
| Net contributions | $ 4 | ||
| Fair value of investment assets related to deferred compensation plan | 53 | 47 | |
| Gains (losses) on investments | $ 7 | $ (10) | $ 5 | 
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- Definition Deferred Compensation Arrangement with Individual, Contributions by Employer, Net Of Withdrawals No definition available. 
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- Definition Deferred Compensation Arrangement with Individual, Gain (Loss) on Investment No definition available. 
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- References No definition available. 
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- 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. 
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- 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 
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