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Acquisition, Collaborations and Other Arrangements - Acquisition (Details) - USD ($) $ / shares in Units, $ in Millions |  | 9 Months Ended
--- | --- | ---
Oct. 03, 2017 | Sep. 30, 2018
Business Acquisition [Line Items] |  |
Total consideration transferred | $ 11,155 |
Replaced stock-based compensation attributable to the pre-combination period | 75 |
Payments to Outstanding Common Stockholders |  |
Business Acquisition [Line Items] |  |
Cash consideration | 10,420 |
Payments to Vested Equity Award Holders |  |
Business Acquisition [Line Items] |  |
Cash consideration | 645 |
Payments to Warrant Holders |  |
Business Acquisition [Line Items] |  |
Cash consideration | $ 15 |
Kite Pharma, Inc |  |
Business Acquisition [Line Items] |  |
Share price (in dollars per share) | $ 180 |
Reduction to goodwill |  | $ 42
Kite Pharma, Inc | Share Based Compensation Expense |  |
Business Acquisition [Line Items] |  |
Replaced stock-based compensation attributable to the post-combination period | $ 733 |

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