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Acquisitions - Narrative (Details) $ in Millions |  |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 16, 2020 USD ($) | Jun. 16, 2020 USD ($) | Feb. 01, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Feb. 14, 2019 | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 3,843 | $ 3,122 | $ 3,843 |  | $ 2,290
Finite-lived intangible assets |  |  |  |  | $ 776 |  |  |
Software and technology |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Weighted average useful lives (years) |  |  |  |  | 7 years |  |  |
Pandora |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  | 1,553 | $ 832 | 1,553 |  | $ 0
Stitcher |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Payments to acquire businesses, gross | $ 272 |  |  |  |  |  |  |
Contingent consideration, liability | 30 |  |  |  |  |  |  |
Consideration for acquisition | 296 |  |  |  |  |  |  |
Acquisition and restructuring costs |  |  |  |  | 4 |  |  |
Goodwill | 218 |  |  |  |  |  |  |
Amortizable intangible assets acquired | 38 | $ 38 |  |  |  |  |  |
Working capital adjustments | 6 |  |  |  |  |  |  |
Stitcher | Maximum |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Contingent consideration, liability | $ 60 |  |  |  |  |  |  |
Simplecast |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Payments to acquire businesses, gross |  | 28 |  |  |  |  |  |
Acquisition and restructuring costs |  |  |  |  | 1 |  |  |
Goodwill |  | 17 |  |  |  |  |  |
Amortizable intangible assets acquired |  | 12 |  |  |  |  |  |
Deferred tax liabilities acquired |  | 1 |  |  |  |  |  |
Simplecast | Maximum |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Other assets acquired |  | $ 1 |  |  |  |  |  |
Pandora |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Consideration for acquisition |  |  | $ 2,879 |  |  |  |  |
Acquisition and restructuring costs |  |  |  |  |  | 84 |  |
Goodwill |  |  | 1,553 |  | 1,553 |  |  |
Amortizable intangible assets acquired |  |  | 1,107 |  |  |  |  |
Consideration of common stock and replacement equity awards for pre-combination service |  |  | $ 2,355 |  |  |  |  |
Exchange ratio (in shares per share) |  |  | 1.44 |  |  |  |  |
Sirius XM’s Pandora preferred stock investment (related party fair value instrument) canceled |  |  | $ 524 |  |  |  |  |
Acquisition of business, net of cash acquired |  |  | $ 313 |  |  |  |  |
Gross operating loss carryforwards |  |  |  |  | 1,287 |  |  |
Revenue of acquire since acquisition date, actual |  |  |  |  |  | $ 1,607 |  |
Net loss |  |  |  | $ 303 |  |  |  |
Pandora | Trademarks |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Fair value of acquired trademarks |  |  |  |  | $ 331 |  |  |
Senior Notes | 1.75% Senior Notes Due 2020 |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  | 1.75% |  |  |
Senior Notes | 1.75% Senior Notes Due 2020 | Pandora |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  | 1.75% |  | 1.75% |
Senior Notes | 1.75% Senior Notes Due 2023 |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  | 1.75% |  |  |

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