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Collaborations - Kyowa Kirin (Details) - Kyowa Kirin Co. Ltd. - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |
Up-front payment | $ 400 |  |  |
Contingent future milestone payments |  | $ 850 |  |
Research and development |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |
Cost recoveries |  | $ 93 | $ 0 | $ 0

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