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Acquisitions - Narrative (Details) $ in Millions |  |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 16, 2020 USD ($) | Feb. 01, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Feb. 14, 2019
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 3,860 | $ 3,843 |
Simplecast |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Consideration for acquisition | $ 28 |  |  |  |  |  |
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 |  |  |  |  |
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 |  |  |  |  |
Acquisition and restructuring costs |  |  | $ 0 | $ 83 |  |  |
Revenue |  |  | 447 | 1,139 |  |  |
Net loss |  |  | $ 47 | $ 225 |  |  |
Senior Notes | 1.75% Senior Notes Due 2020 |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  | 1.75% | 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% | 1.75% |

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