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Revenues - Summary of Transaction Price and Allocation of Transaction Price to the Performance Obligations (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Jun. 30, 2025
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Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Total transaction price |  | $ 256
Taiho Pharmaceutical Co., Ltd |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Total transaction price | $ 15 |
License and development services |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Total transaction price |  | 192
License | Taiho Pharmaceutical Co., Ltd |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Total transaction price | 7 |
Development services |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Total transaction price |  | 17
R&D services | Taiho Pharmaceutical Co., Ltd |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Total transaction price | $ 8 |
Access right and option continuation periods |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Total transaction price |  | 30
Rights to certain studies |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Total transaction price |  | $ 17

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