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Business & Basis of Presentation (Details) subscriber in Millions, $ in Millions |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 16, 2020 USD ($) | Jun. 16, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) segment satellite_radio_system subscriber | Sep. 30, 2020 USD ($) | Dec. 31, 2020 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 |  |  |
Impairment, restructuring and acquisition costs |  |  | $ (95) | $ 0 | $ 13 | $ 24 |  |
Benefit in amount of contingent consideration, liability |  |  | 17 |  | 17 |  |  |
Disposal Group, Not Discontinued Operations | Automatic Labs Inc |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Impairment, restructuring and acquisition costs |  |  |  | $ 0 |  | $ 24 |  |
Simplecast |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Payments to acquire businesses, gross |  | $ 28 |  |  |  |  |  |
Stitcher |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Payments to acquire businesses, gross | $ 266 |  |  |  |  |  |  |
Consideration for acquisition | 302 |  |  |  |  |  |  |
Contingent consideration, liability | $ 36 |  |  |  |  |  |  |
Contingent consideration potential additional payments |  |  | $ 30 |  | $ 30 |  |  |
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% |  |  |
Equity method investments |  |  | $ 338 |  | $ 338 |  | $ 332 |
SoundCloud Holdings, LLC |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  | $ 75
Liberty Media | Management | Common Stock |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Related party ownership percentage |  |  | 79.00% |  | 79.00% |  |  |
Sirius XM |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Number of subscribers | subscriber |  |  |  |  | 34.3 |  |  |
Pandora |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Number of subscribers | subscriber |  |  |  |  | 6.5 |  |  |

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