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Business & Basis of Presentation (Details) subscriber in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 16, 2020 USD ($) | Jun. 16, 2020 USD ($) | Dec. 31, 2020 USD ($) segment satellite_radio_system subscriber | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Feb. 10, 2020 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |
Number of reportable segments | segment |  |  | 2 |  |  |
Number of satellite radio systems | satellite_radio_system |  |  | 2 |  |  |
Loss on restructuring |  |  | $ 24,000,000 | $ 0 | $ 0 |
Automatic Labs Inc. | Disposal Group, Not Discontinued Operations |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Loss on restructuring |  |  | $ 24,000,000 |  |  |
Simplecast |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Payments to acquire businesses, gross |  | $ 28,000,000 |  |  |  |
Stitcher |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Consideration for acquisition | $ 296,000,000 |  |  |  |  |
Payments to acquire businesses, gross | 272,000,000 |  |  |  |  |
Contingent consideration, liability | 30,000,000 |  |  |  |  |
Working capital adjustments | $ 6,000,000 |  |  |  |  |
SoundCloud Holdings, LLC |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 75,000,000
Equity Method Investee | Sirius XM Canada |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Equity method investment, equity interest percentage |  |  | 70.00% |  |  |
Equity method investment, voting interest percentage |  |  | 33.00% |  |  |
Equity method investments |  |  | $ 332,000,000 | $ 321,000,000 |  |
Common Stock | Management | Liberty Media |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party ownership percentage |  |  | 76.00% |  |  |
Sirius XM |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Number of subscribers | subscriber |  |  | 34.7 |  |  |
Pandora |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Number of subscribers | subscriber |  |  | 6.3 |  |  |

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