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Business & Basis of Presentation (Details) $ / shares in Units, subscriber in Millions |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 09, 2024 $ / shares | Sep. 30, 2025 USD ($) $ / shares | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) segment subscriber satelliteRadioSystem $ / shares | Sep. 30, 2024 USD ($) | Dec. 31, 2024 $ / shares | Jun. 16, 2024
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Common stock, par value (in USD per share) | $ / shares | $ 0.001 | $ 0.001 |  | $ 0.001 |  | $ 0.001 |
Conversion ratio | 0.1 |  |  | 0.10 |  |  |
Number of reportable segments | segment |  |  |  | 2 |  |  |
Number of operating segments | segment |  |  |  | 2 |  |  |
Number of satellite radio systems | satelliteRadioSystem |  |  |  | 2 |  |  |
Merger related costs | $ |  | $ 0 | $ 3,000,000 | $ 0 | $ 15,000,000 |  |
Acquisition related costs | $ |  | $ 6,000,000 | $ 32,000,000 | $ 6,000,000 | $ 68,000,000 |  |
Liberty Sirius XM |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Common stock, par value (in USD per share) | $ / shares | $ 0.01 |  |  |  |  |  |
Redemption ratio | 0.8375 |  |  |  |  |  |
Pandora |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Number of subscribers | subscriber |  |  |  | 5.7 |  |  |
Sirius XM Holdings, Inc. |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Redemption ratio |  |  |  |  |  |  | 0.1
Sirius XM Canada | Equity Method Investee |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Equity method investment, equity interest percentage |  | 70.00% |  | 70.00% |  |  |
Equity method investment, voting interest percentage |  | 33.00% |  | 33.00% |  |  |
SiriusXM |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Number of subscribers | subscriber |  |  |  | 32.8 |  |  |

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