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Certain Transactions - Other Transactions - Additional Information (Detail) - USD ($) $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 08, 2018 | May 12, 2017 | Sep. 30, 2016 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2016 | Sep. 30, 2020 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019
Noncash or Part Noncash Acquisitions [Line Items] |  |  |  |  |  |  |  |  |  |
Operating lease right-of-use assets |  |  |  | $ 557 |  |  | $ 557 |  |  | $ 514
Tel-Aviv Headquarters Lease Agreement [Member] |  |  |  |  |  |  |  |  |  |
Noncash or Part Noncash Acquisitions [Line Items] |  |  |  |  |  |  |  |  |  |
Operating lease right-of-use assets |  |  |  | 74 |  |  | 74 |  |  |
Operating lease liability |  |  |  | $ 66 |  |  | $ 66 |  |  |
Lessee, operating lease, term of contract |  |  |  | 12 years 6 months |  |  | 12 years 6 months |  |  |
Lessee, operating lease, option to extend |  |  |  | with an option for three extensions |  |  |  |  |  |
Alder [Member] |  |  |  |  |  |  |  |  |  |
Noncash or Part Noncash Acquisitions [Line Items] |  |  |  |  |  |  |  |  |  |
Upfront payment | $ 25 |  |  |  |  |  |  |  |  |
Milestone payment |  |  |  |  | $ 25 |  |  |  |  |
Collaborative agreement milestone payments | $ 150 |  |  |  |  |  |  |  |  |
Otsuka [Member] |  |  |  |  |  |  |  |  |  |
Noncash or Part Noncash Acquisitions [Line Items] |  |  |  |  |  |  |  |  |  |
Upfront payment |  | $ 50 |  |  |  |  |  |  |  |
Milestone payment |  |  |  | $ 15 |  |  |  |  |  |
Celltrion [Member] |  |  |  |  |  |  |  |  |  |
Noncash or Part Noncash Acquisitions [Line Items] |  |  |  |  |  |  |  |  |  |
Refundable payment |  |  |  | 60 |  |  | $ 60 |  |  |
Total associated cost |  |  |  | $ 160 |  |  | 160 |  |  |
Regeneron [Member] |  |  |  |  |  |  |  |  |  |
Noncash or Part Noncash Acquisitions [Line Items] |  |  |  |  |  |  |  |  |  |
Upfront payment |  |  |  |  |  | $ 250 |  |  |  |
Collaborative agreement milestone payments |  |  | $ 2,230 |  |  |  |  | $ 120 | $ 120 |
Research and development costs |  |  | $ 1,000 |  |  |  |  |  |  |
Alvotech [Member] |  |  |  |  |  |  |  |  |  |
Noncash or Part Noncash Acquisitions [Line Items] |  |  |  |  |  |  |  |  |  |
Collaborative agreement milestone payments |  |  |  |  |  |  | $ 490 |  |  |

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- Definition Description of terms and conditions of option to extend lessee's operating lease. Includes, but is not limited to, information about option recognized as part of right-of-use asset and lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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