Net Product Sales - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Net product sales	$ 145	$ 142	$ 534	$ 250
Net product sales
Disaggregation of Revenue [Line Items]
Gross product sales	122	176	472	281
Wholesaler chargebacks, discounts and fees	(50)	(62)	(39)	(84)
Returns, rebates and other fees	22	0	13	3
Total product sales provision adjustments	(28)	(62)	(26)	(81)
Net product sales	$ 94	$ 114	$ 446	$ 200

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.

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- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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