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Acquisitions Business Combination Details- Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Oct. 03, 2017
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets |  |  |  |  |  | $ 8,950
Business Combination, Consideration Transferred | $ 11,155 |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | 75 |  |  |  |  |
Goodwill Acquired From Business Combination |  |  |  |  |  | 2,945
Goodwill, Period Increase (Decrease) |  |  |  | $ (42) |  |
Research and development expenses |  |  | $ 9,106 | $ 5,018 | $ 3,734 |
Payments to Outstanding Common Stockholders [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Payments to Acquire Businesses, Gross | 10,420 |  |  |  |  |
Payments to Vested Equity Award Holders [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Payments to Acquire Businesses, Gross | 645 |  |  |  |  |
Payments to Warrant Holders [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 15 |  |  |  |  |
Share Based Compensation Expense [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned |  |  |  |  |  | $ 733
Kite Pharma, Inc [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Acquisition, Share Price |  |  |  |  |  | $ 180
Intangible Asset - axicabtagene ciloleucel (DLBCL) [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-Lived Intangible Assets, Period Increase (Decrease) |  | $ 6,200 |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 18 years |  |  |  |
Intangible Asset - Daiichi Sankyo [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  | $ 91 |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 14 years |  |  |  |
Cell Design Labs, Inc. [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Ownership Cell Design Labs, Inc. |  |  |  |  |  | 12.20%
Asset Acquisition Cash Outflow |  | $ 150 |  |  |  |
Regulatory Milestone-based Payments, Maximum |  | 322 |  |  | $ 322 |
Carrying Value of Equity Interest Owned Prior to Acquisition |  |  |  |  |  | $ 30
Research and development expenses |  | $ 172 |  |  |  |

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