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Net Product Sales - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Net product sales	$ 389	$ 108
Net product sales
Disaggregation of Revenue [Line Items]
Gross product sales	350	105
Wholesaler chargebacks, discounts and fees	11	(22)
Returns, rebates and other fees	(9)	3
Total product sales provision adjustments	2	(19)
Net product sales	$ 352	$ 86

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