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Benefit Plans - Sirius XM Holdings Inc. Deferred Compensation Plan (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Retirement Benefits [Abstract] |  |  |  |  |
Contributions to the DCP, net of withdrawals | $ (2) | $ (2) | $ (6) | $ (1) |
Fair value of investment assets related to deferred compensation plan | 60 |  | 60 |  | $ 60
Gains (losses) on investments | $ 3 | $ 2 | $ 6 | $ 7 |

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- Definition Deferred Compensation Arrangement with Individual, Contributions by Employer, Net Of Withdrawals + References No definition available. + Details
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- Definition Deferred Compensation Arrangement with Individual, Gain (Loss) on Investment + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of assets held under deferred compensation agreements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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