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Commitments and Contingencies - Legal Proceedings (Details) $ in Millions	3 Months Ended
	Mar. 31, 2026 USD ($) lawsuit	Dec. 31, 2025 USD ($)
Loss Contingencies [Line Items]
Litigation settlement liability	$ 950
Finite-lived intangible assets, net	116	$ 45
Arbutus Biopharma Corporation (Arbutus) and Genevant Sciences GmbH (Genevant)
Loss Contingencies [Line Items]
Litigation settlement liability	950
Amount awarded to other party	876
Loss contingency, estimate of possible loss	74
Arbutus Biopharma Corporation (Arbutus) and Genevant Sciences GmbH (Genevant) | Maximum
Loss Contingencies [Line Items]
Litigation liability	$ 1,300
Arbutus Biopharma Corporation (Arbutus) and Genevant Sciences GmbH (Genevant) | Intellectual Property
Loss Contingencies [Line Items]
Finite-lived intangible asset, useful life	3 years
Finite-lived intangible assets, net	$ 72
GlaxoSmithKline Biologicals
Loss Contingencies [Line Items]
Number of patent infringement cases | lawsuit	2

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