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Certain Transactions - Other Transactions - Additional Information (Detail) $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jan. 08, 2018 USD ($) | May 12, 2017 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) Lawsuit | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Mar. 31, 2018 USD ($) | Jun. 30, 2017 USD ($) | Oct. 31, 2016 USD ($)
Noncash or Part Noncash Acquisitions [Line Items] |  |  |  |  |  |  |  |  |  |
Other asset impairments, restructuring and other items |  |  |  |  |  | $ 1 |  | $ 501 |  |
Net (gain) loss from sale of long-lived assets and investments |  |  |  |  |  | $ 2 |  | 106 |  |
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 |  |  |  |  |  |  |
Rimsa [Member] |  |  |  |  |  |  |  |  |  |
Noncash or Part Noncash Acquisitions [Line Items] |  |  |  |  |  |  |  |  |  |
Number of lawsuits filed | Lawsuit |  |  |  |  | 2 |  |  |  |  |
Alder [Member] |  |  |  |  |  |  |  |  |  |
Noncash or Part Noncash Acquisitions [Line Items] |  |  |  |  |  |  |  |  |  |
Upfront payment | $ 25 |  |  |  |  |  |  |  |  |
Collaborative agreement milestone payments | $ 175 |  |  |  |  |  |  |  |  |
Otsuka [Member] |  |  |  |  |  |  |  |  |  |
Noncash or Part Noncash Acquisitions [Line Items] |  |  |  |  |  |  |  |  |  |
Upfront payment |  | $ 50 |  |  |  |  |  |  |  |
Attenukine [Member] |  |  |  |  |  |  |  |  |  |
Noncash or Part Noncash Acquisitions [Line Items] |  |  |  |  |  |  |  |  |  |
Upfront payment |  |  |  | $ 30 |  |  |  |  |  |
Additional considerations |  |  |  | $ 280 |  |  |  |  |  |
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 |  |  |  |  |
Collaborative agreement milestone payments |  |  |  |  |  |  | $ 25 | $ 35 | $ 60 |
Research and development costs |  |  |  |  | $ 1,000 |  |  |  |  |

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