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Net Product Sales - Product Sales (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Total revenue	$ 241	$ 344	$ 408	$ 2,206
Net product sales
Disaggregation of Revenue [Line Items]
Gross product sales	191	293	413	2,121
Wholesaler chargebacks, discounts and fees	22	0	0	0
Returns and other fees	(29)	0	(62)	0
Total product sales provision	(7)	0	(62)	0
Total revenue	$ 184	$ 293	$ 351	$ 2,121

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