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Commitments and Contingencies - Licenses to Patented Technology (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Jan. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Lessee, Lease, Description [Line Items]
Payments to acquire intangible assets		$ 0	$ 10
Consideration paid		895	$ 5
National Institute of Allergy and Infectious Diseases member
Lessee, Lease, Description [Line Items]
Payments to acquire intangible assets	$ 10
Arbutus Biopharma Corporation (Arbutus) and Genevant Sciences GmbH (Genevant)
Lessee, Lease, Description [Line Items]
Amount awarded to other party		$ 878

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7A
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-3

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- Definition

The cash outflows from the purchase of net carrying value allocated to in-process research and development costs and materials acquired in a business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
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+ References

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-Section 45
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