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Benefit Plans - Additional Information (Details) $ / shares in Units, shares in Millions, $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Feb. 01, 2019 USD ($) | Mar. 31, 2019 USD ($) $ / shares shares | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |
Share-based payment expense |  | $ (70) | $ (34) |
Goodwill |  | 3,831 |  | $ 2,290
Share-based payment expense |  | $ 70 | 34 |
Pandora |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Exchange ratio (in shares per share) | 1.44 |  |  |
Goodwill | $ 1,541 |  |  |
Employees and Non Employee Stock Option |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Grant date fair value of options (in dollars per share) | $ / shares |  | $ 1.26 |  |
Options exercised in period, intrinsic value |  | $ 10 | 55 |
Exercise of options and vesting of restricted stock units (in shares) | shares |  | 1 |  |
Share-based payment expense |  | $ 20 | 19 |
Pre-Acquisition Replacement Equity Awards |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | 8 |  |
Restricted Stock Units (RSUs) and Performance Shares |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Restricted stock units vested, intrinsic value |  | $ 74 | 1 |
Granted (in shares) | shares |  | 11 |  |
Share-based payment expense |  | $ 50 | $ 15 |
Restricted Stock Units (RSUs) |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Exercise of options and vesting of restricted stock units (in shares) | shares |  | 7 |  |
Performance-based Share Awards |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Granted (in shares) | shares |  | 5 |  |
Pre-Acquisition Replacement Equity Awards, Restricted Stock Units |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 62 |  |
Restricted Stock Units Rsu And Stock Options |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Unrecognized compensation costs |  | $ 477 |  | $ 254
Weighted-average service period (in years) |  | 2 years |  |
Acquisition-related Costs |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Share-based payment expense |  | $ (21) |  |
Maximum | Restricted Stock Units (RSUs) and Performance Shares |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Restricted stock units granted (in shares) | shares |  | 1 |  |

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