Acquisition, Discontinued Operations, Equity-Method Investment and Collaborative Arrangement - Collaborative Arrangements (Detail) - USD ($) $ / shares in Units, $ in Millions |
1 Months Ended | |
|---|---|---|
Jan. 04, 2022 |
Oct. 31, 2022 |
|
| Biohaven [Member] | Subsequent Event [Member] | ||
| Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] | ||
| Business acquisition, per share in cash (in dollars per share) | $ 148.50 | |
| Payments for acquisition, cash portion | $ 11,500 | |
| Collaborative Arrangement [Member] | Biohaven [Member] | ||
| Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] | ||
| Payment to collaborators | $ 500 | |
| Upfront payment to collaborators | 150 | |
| Committed investment from collaborator | 350 | |
| Collaborative Arrangement [Member] | Biohaven [Member] | Acquired In-Process Research and Development Expense [Member] | ||
| Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] | ||
| Upfront payment and premium paid in equity investment | $ 263 |