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Acquisitions and Licensing Arrangements - Narrative (Details) - USD ($) $ in Millions		1 Months Ended			3 Months Ended			6 Months Ended	12 Months Ended
	Oct. 28, 2024	Mar. 31, 2025	Feb. 28, 2025	Jan. 31, 2025	Sep. 30, 2025	Mar. 31, 2025	Mar. 31, 2024	Jun. 30, 2026	Jun. 30, 2026
Asset Acquisition [Line Items]
Acquired in-process research and development and milestones						$ 10	$ 0
Suzhou Centergene Pharmaceuticals | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Asset Acquisition [Line Items]
Acquired in-process research and development and milestones						6
Shanghai Henlius Biotech, Inc. | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Asset Acquisition [Line Items]
Acquired in-process research and development and milestones			$ 10
Product Rights | Lilly
Asset Acquisition [Line Items]
Payment for regulatory milestones				$ 20
Noncurrent liability		$ 240				$ 240
Biogen Inc.
Asset Acquisition [Line Items]
Upfront payments		51
Currently marketed products - products and product right		$ 51
Amortize the asset useful life (in years)		10 years				10 years
Biogen Inc. | Achievement Of Commercial Milestones, Tiered Royalties On Net Sales, And Assumption Of Liabilities
Asset Acquisition [Line Items]
Milestone payment		$ 45				$ 45
Dermavant Sciences Ltd
Asset Acquisition [Line Items]
Upfront payments	$ 175
Milestone obligations	1,025
Aggregate purchase price consideration	581
Dermavant Sciences Ltd | Licensing Agreements
Asset Acquisition [Line Items]
Payment for regulatory milestones						35
Dermavant Sciences Ltd | Milestone Payment Upon Regulatory Approval
Asset Acquisition [Line Items]
Milestone payment	75
Payment for regulatory milestones						$ 75
Dermavant Sciences Ltd | Achievement Of Commercial Milestones, Tiered Royalties On Net Sales, And Assumption Of Liabilities
Asset Acquisition [Line Items]
Milestone payment	950
Dermavant Sciences Ltd | Cash Payable Upon Regulatory Approval
Asset Acquisition [Line Items]
Milestone obligations	75
Dermavant Sciences Ltd | Cash Payable Achievements Of Certain Commercial Milestones
Asset Acquisition [Line Items]
Milestone obligations	$ 950
Oss Biotech Site | Forecast
Asset Acquisition [Line Items]
Aggregate purchase price consideration					$ 15			$ 10	$ 25

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