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Goodwill (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) reporting_unit | Jun. 30, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |
Number of reporting units | reporting_unit |  |  | 2 |
Impairment losses for goodwill | $ 0 | $ 0 | $ 0 | $ 0
Accumulated impairment of goodwill since the merger | $ 4,766,000,000 |  | 4,766,000,000 |
Pandora |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill acquired during period |  |  | $ 1,562,000,000 |

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