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Acquisition - Consideration Transferred (Details) $ / shares in Units, shares in Millions, $ in Millions | Feb. 01, 2019 USD ($) $ / shares shares | Jun. 30, 2019 $ / shares | Dec. 31, 2018 $ / shares
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Business Acquisition [Line Items] |  |  |
Common stock, par value (in dollars per share) | $ / shares |  | $ 0.001 | $ 0.001
Pandora |  |  |
Business Acquisition [Line Items] |  |  |
Pandora common stock outstanding at February 1, 2019 (shares) | $ 272 |  |
Exchange ratio (in shares per share) | 1.44 |  |
Price per share of Holdings common stock as of February 1, 2019 (in dollars per share) | $ / shares | $ 5.83 |  |
Value of common stock issued to Pandora stockholders pursuant to the transactions | $ 2,285 |  |
Value of replacement equity awards attributable to pre-combination service | 70 |  |
Consideration of common stock and replacement equity awards for pre-combination service | 2,355 |  |
Sirius XM’s Pandora preferred stock investment (related party fair value instrument) canceled | 524 |  |
Purchase price | 2,879 |  |
Value attributed to par at $0.001 par value | $ 1 |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.001 |  |
Balance to capital in excess of par value | $ 2,354 |  |
Common Stock | Pandora |  |  |
Business Acquisition [Line Items] |  |  |
Common stock issued (in shares) | shares | 392 |  |

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