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Certain Transactions - Other Transactions - Additional Information (Detail) - USD ($) $ in Millions |  |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 08, 2018 | May 12, 2017 | Sep. 30, 2018 | Sep. 30, 2016 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018 | Sep. 30, 2016 | Oct. 31, 2016
Noncash or Part Noncash Acquisitions [Line Items] |  |  |  |  |  |  |  |  |
Other asset impairments, restructuring and other items |  |  |  |  | $ 121 | $ 1 |  |  |
Net (gain) loss from sale of long-lived assets and investments |  |  |  |  | 24 | $ (2) |  |  |
PGT Healthcare Partnership [Member] |  |  |  |  |  |  |  |  |
Noncash or Part Noncash Acquisitions [Line Items] |  |  |  |  |  |  |  |  |
Other asset impairments, restructuring and other items |  |  |  |  |  |  | $ 64 |  |
Write-down of investment |  |  |  |  |  |  | $ 94 |  |
Net (gain) loss from sale of long-lived assets and investments |  |  | $ 50 |  |  |  |  |  |
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 |  |  |  |  |  |  |
Celltrion [Member] |  |  |  |  |  |  |  |  |
Noncash or Part Noncash Acquisitions [Line Items] |  |  |  |  |  |  |  |  |
Refundable payment |  |  |  |  |  |  |  |  | $ 60
Total associated cost |  |  |  |  |  |  |  |  | $ 160
Regeneron [Member] |  |  |  |  |  |  |  |  |
Noncash or Part Noncash Acquisitions [Line Items] |  |  |  |  |  |  |  |  |
Upfront payment |  |  |  |  |  |  |  | $ 250 |
Research and development costs |  |  |  | $ 1,000 |  |  |  |  |

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