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Acquisition, Divestitures, Licensing Arrangements, Collaborative Arrangements and Privately Held Investment - Allogene (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 31, 2018 | Apr. 30, 2018 | Jul. 01, 2018 | Sep. 30, 2018 | Dec. 31, 2014 | Dec. 31, 2017
Investment [Line Items] |  |  |  |  |  |
Fair value of equity investment |  |  |  | $ 1,213 |  | $ 2,150
Allogene [Member] |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |
Investment ownership percentage |  | 25.00% |  |  |  |
Non-cash pre-tax gain from the difference between the fair value of equity investment received and book value of assets transferred |  |  | $ 50 | 50 |  |
Cellectis [Member] |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |
Investment ownership percentage |  |  |  |  | 7.00% |
Upfront payment to Cellectis |  |  |  |  | $ 80 |
Subsequent Event [Member] | Allogene [Member] |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |
Investment ownership percentage | 19.00% |  |  |  |  |
Long-term Investments [Member] | Allogene [Member] |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |
Fair value of equity investment |  |  |  | $ 127 |  |
Allogene [Member] | Subsequent Event [Member] |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |
Price per share (in dollars per share) | $ 25 |  |  |  |  |

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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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